Learning Objectives for Simple Interest

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Presentation transcript:

Learning Objectives for Simple Interest The student will be able to compute simple interest using the simple interest formula. The student will be able to solve problems involving investments and the simple interest formula. Barnett/Ziegler/Byleen Finite Mathematics 11e

Simple Interest Definition: I = Prt I = interest earned P = principal (amount invested) r = interest rate (as a decimal) t = time Barnett/Ziegler/Byleen Finite Mathematics 11e

An Example Find the interest on a boat loan of $5,000 at 16% for 8 months. Barnett/Ziegler/Byleen Finite Mathematics 11e

Example Find the interest on a boat loan of $5,000 at 16% for 8 months. Solution: Use I = Prt I = 5,000(0.16)(0.6667) (8 months = 8/12 of one year 0.6667 years) I = $533.33 Barnett/Ziegler/Byleen Finite Mathematics 11e

Total Amount to Be Paid Back The total amount to be paid back for the boat loan would be $5000 plus the interest of $533.33, for a total of $5,533.33. In general, the future value (amount) is given by the following equation: A = P + Prt = P (1 + rt) Barnett/Ziegler/Byleen Finite Mathematics 11e

Another Example Find the total amount due on a loan of $600 at 16% interest at the end of 15 months. Barnett/Ziegler/Byleen Finite Mathematics 11e

Another Example Find the total amount due on a loan of $600 at 16% interest at the end of 15 months. Solution: A = P (1 + rt) A = 600(1+0.16(1.25)) A = $720.00 Barnett/Ziegler/Byleen Finite Mathematics 11e

Interest Rate Earned on a Note What is the annual interest rate earned by a 33-day T-bill with a maturity value of $1,000 that sells for $996.16? Barnett/Ziegler/Byleen Finite Mathematics 11e

Interest Rate Earned on a Note Solution Solution: Use the equation A = P (1 + rt) 1,000 = 996.16 We normally use 360 days for a financial year Barnett/Ziegler/Byleen Finite Mathematics 11e

Another Application A department store charges 18.6% interest (annual) for overdue accounts. How much interest will be owed on a $1080 account that is 3 months overdue? Barnett/Ziegler/Byleen Finite Mathematics 11e

Another Application A department store charges 18.6% interest (annual) for overdue accounts. How much interest will be owed on a $1080 account that is 3 months overdue? Solution: I = Prt I = 1080(0.186)(0.25) I = $50.22 Barnett/Ziegler/Byleen Finite Mathematics 11e