6-6 Simple and Compound Interest
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1 Find the simple interest. Round to the nearest cent, if necessary. 1. $1350 at 6% for 7 years $ $240 at 8% for 9 months $ $725 at 3.25% for 5 years $ $3750 at 5.75% for 42 months $ Mateo s sister paid off her student loan of $5000 in 3 years. If she made a payment of $ each month, what was her simple interest rate for her loan? Round to the nearest hundredth. 3.23% nearest cent if the interest is compounded annually. 6. $480 at 5% for 3 years $ $515 at 11.8% for 2 years $ $6525 at 6.25% for 4 years $ $2750 at 8.5% for 3 years $ Find the simple interest. Round to the nearest cent, if necessary. 10. $275 at 7.5% for 4 years $ $620 at 6.25% for 5 years $ $734 at 12% for 3 months $ $2020 at 8% for 18 months $ $1200 at 6% for 36 months $ $4380 at 10.5% for 2 years $ Thomas borrowed $4800 to buy a new car. He will be paying $96 each month for the next 60 months. Find the simple interest rate for his car loan. 4% nearest cent if the interest is compounded annually. 17. $3850 at 5.25% for 2 years $ esolutions Manual - Powered by Cognero Page 1
2 18. $4025 at 6.8% for 6 years $ $595 at 4.75% for 3 years $ $840 at 7% for 4 years $ $12,000 at 6.95% for 4 years $15, $8750 at 12.25% for 2 years $11, Denise has a car loan of $8000. Over the course of the loan, she paid a total of $1680 in interest at a simple interest rate of 6%. How many months was the loan? 42 months 24. A certificate of deposit has an annual simple interest rate of 5.25%. If $567 in interest is earned over a 6 year period, how much was invested? $ Financial Literacy A bank offers the options shown for interest rates on their savings accounts. Which option will yield more money after 3 years with an initial deposit of $1500? Explain. Option A; Sample answer: Option A earned $ in interest and Option B earned $ nearest cent if the interest is compounded twice a year. 26. $2500 at 6.75% for 1 year $ $14,750 at 5% for 1 year $15, $3750 at 10.25% for 2 years $ $975 at 7.2% for 2 years $ Mrs. Glover placed $15,000 in a certificate of deposit for 18 months for her children s college funds. Each month she makes $56.50 in interest. Find the annual simple interest rate for the certificate of deposit. 4.52% esolutions Manual - Powered by Cognero Page 2
3 31. Jameson received his first credit card bill for a total of $ Each month he makes a $50 payment and the remaining balance is charged an interest rate of 1.5%. The table below shows his first three monthly bills. If he does not make any more charges, what will be the amount of the fifth bill? the seventh bill? b. $137.77; $39.68 Answers may vary due to rounding. 32. Multiple Representations In this problem, you will compare simple and compound interest. Consider the following situation. Ben deposits $550 at a 6% simple interest rate and Anica deposits $550 at a 6% interest rate that is compounded annually. a. Table Copy and complete the table. b. Graph Graph the data on the coordinate plane. Show the time in years on the x-axis and the total interest earned in dollars on the y-axis. Plot Ben s interest balance in blue and Anica s interest in red. Then connect the points. c. Analyze Compare the graphs of the two functions. a. Answers may vary due to rounding. c. Sample answer: The graph of Ben s interest is in a straight line. The graph of Anica s interest is increasing at a faster rate and is not in a straight line. 33. Model with Mathematics Give a principal and interest rate where the amount of simple interest earned in four years would be $80. Justify your answer. Sample answer: $2000 at 1%. Using the simple interest formula I = $ or $ Justify Conclusions Kai-Yo deposits $500 into an account that earns 2% simple interest. Marcos deposits $250 into an account that earns 4% simple interest. How much money does each have after 10 years? Who will have more money over the long run? Explain your reasoning. Kai-Yo: $600, Marcos: $350; Even though Kai-Yo and Marcos earn the same amount of interest after every year, Kai-Yo will always have $250 more than Marcos because that was the difference in the initial deposit. esolutions Manual - Powered by Cognero Page 3
4 35. Find the Error Sabino is finding the simple interest on a $2500 investment at a simple interest rate of 5.75% for 18 months. Find his mistake and correct it. No; Sabino did not convert the time to years. If he multiplies , the interest is $ Persevere with Problems Determine the length of time it will take to double a principal of $100 if deposited into an account that earns 10% simple annual interest. 10 years 37. Building on the Essential Question Compare simple and compound interest. Sample Answer: With simple interest, the amount of money earned will be the same each year because it is always applied to the initial amount. With compound interest, the amount of interest will increase each year because it is being applied to the new total after the interest is added each year. 38. A $500 certificate of deposit has a simple interest rate of 7.25%. What is the value of the certificate after 8 years? A $290 B $500 C $790 D $2900 C 39. Beatriz borrowed $1500 for student loans. She will make 30 equal payments of $62.50 to pay off the loan. What is the simple interest rate for the loan? F 4% G 7% H 8.5% J 10% J 40. A savings account with $2250 has an interest rate of 5%. If the interest is compounded annually, how much will be in the account after 2 years? A $ B $ C $ D $ C 41. Short Response Which of the following plans will produce the greater earnings for an investment of $500 over 5 years? How much more will that plan earn? Plan B; $ In 2000, there were 356 endangered species. Nine years later, 360 species were considered endangered. What was the percent of change? Round to the nearest tenth. 1.1% Solve each problem using the percent equation is what percent of 400? 3% esolutions Manual - Powered by Cognero Page 4
5 is 60% of what number? In a recent year, the number of $1 bills in circulation in the United States was about 7 billion. a. Suppose the number of $5 bills in circulation was 25% of the number of $1 bills. About how many $5 bills were in circulation? b. If the number of $10 bills was 20% of the number of $1 bills, about how many $10 bills were in circulation? a. 7 or 1.75 billion b. 7 or 1.4 billion Find each product. Write in simplest form. 49. The table shows the amount of time Craig spends jogging every day. He increases the time he jogs every day. a. Write an equation to show the number of minutes spent jogging m for each day d. b. How many minutes will Craig jog during day 9? a. m = 8d 1 b. 71 min Solve each problem. 50. Find 66% of What is 0.2% of 735? Find 250% of , A meteorologist predicted that the downtown area would get 16 inches of snow in a snowstorm. The downtown area ended up getting 13 inches of snow. What was the percent error of the prediction? 23.1% esolutions Manual - Powered by Cognero Page 5
6-6 Simple and Compound Interest
Find the simple interest. Round to the nearest cent, if necessary. 1. $1350 at 6% for 7 years The simple interest is $567. 2. $240 at 8% for 9 months 9 months is equivalent to of a year. The simple interest
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