Section 3.5: COMPOUND INTEREST FORMULA
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1 Section 3.5: COMPOUND INTEREST FORMULA OBJECTIVES Become familiar with the derivation of the compound interest formula. Make computations using the compound interest formula. Key Terms compound interest formula annual percentage rate (APR) annual percentage yield (APY) Section 3.5 1
2 You decide to start saving money for college and deposit $1,000into a savings account with an interest rate of 1.95%where interest is compounded daily. How much money would you have in 4years? Can this problem be solved using the simple interest formula? If so, how many computations are necessary? 1. Numerical examples and algebra can be combined to uncover a pattern that leads to a formula that finds compound interest. The compound interest formularelates principal, interest rate, the number of times interest is compounded per year, and the number of years the money will be in the account, and the ending balance. Formula is used for any type of compounding: Annually, semiannually, quarterly, monthly, weekly, daily and so on. Section 3.5 2
3 How is the formula derived? Ellen opens a savings account with principal dollars that pays 2%interest compounded quarterly. What will be her ending balance after one year? How is the formula derived? Section 3.5 3
4 Compound Interest Formula = + B= ending balance p = principal or original balance r= interest rate expressed as a decimal n= number of times interest is compounded annually t = number of years Example 1 Harold deposits $800 at 3.87% interest, compounded quarterly. What is his ending balance after one year? Example 2(a) Nancy deposits $1,200 into an account that pays 3% interest, compounded monthly. What is her ending balance after one year? Section 3.5 4
5 Example 2(b) Nancy receives two offers in the mail from other banks. One is an account that pays 2.78% compounded daily. The other account pays 3.25% compounded quarterly. Would either of these accounts provide Nancy with a better return than her current account? If so, which account? Example 3 Nolan deposits $1,650 for three years at 3% interest, compounded weekly. What is his ending balance? Section 3.5 5
6 2. Banks call the annual interest rate,, used to compute interest the annual percentage rate (APR). 3. Most banks advertise the annual percentage yield (APY)for savings accounts, for example, since this rate is higher than the APR for accounts compounded more than once per year. Do you think banks advertise for loans and credit cards the same way they advertise savings accounts? APYis calculated using the formula: + where is the interest rate and is the number of times interest is compounded per year Section 3.5 6
7 Example 4 Sharon deposits $8,000 in a one year CD at 3.2% interest, compounded daily. What is Sharon s annual percentage yield (APY) to the nearest hundredth of a percent? Example 5 Barbara deposits $3,000 in a one year CD at 4.1% interest, compounded monthly. What is the APY to the nearest hundredth of a percent? Example 6 Consider an amount xdeposited into a CD at 2.4% interest compounded daily, and the same amount deposited into a CD at the same rate that compounds monthly. Explain why, after 1 year, the balance on a CD that compounds daily is greater than the CD that compounded monthly. Section 3.5 7
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