Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 1 3-5 COMPOUND INTEREST FORMULA Become familiar with the derivation of the compound.

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Presentation transcript:

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide COMPOUND INTEREST FORMULA Become familiar with the derivation of the compound interest formula. Make computations using the compound interest formula. OBJECTIVES

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 2 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 Compound Interest Formula

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 3 compound interest formula annual percentage rate (APR) annual percentage yield (APY) Key Terms

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 4 Example 1 Jose opens a savings account with principal P dollars that pays 5% interest, compounded quarterly. What will his ending balance be after one year?

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 5 EXAMPLE 2 Marie deposits $1,650 for three years at 3% interest, compounded daily. What is her ending balance?

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 6 Write an algebraic expression for the ending balance after k years of an account that starts with a balance of $2,000 and earns interest at a rate of 3.5%, compounded daily. EXTEND YOUR UNDERSTANDING

Financial Algebra © 2011 Cengage Learning. All Rights Reserved. Slide 7 EXAMPLE 3 Barbara deposits $3,000 in a one year CD at 4.1% interest, compounded daily. What is the APY to the nearest hundredth of a percent?