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Simple Interest Powerpoint Presentation (PPT)/Lesson/Slides

Subject: Mathematics

Age range: 11-14

Resource type: Lesson (complete)

Last updated

9 October 2024

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The presentation contains 15 SLIDES: Definition of Simple interest. Vocabulary on different terms used in simple interest e.g. time, principal. Formula of simple interest. Formula of Amount. Explanation of rate of interest with an example. Real life problems of finding different parameters of the formula.

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Simple Interest

Mar 16, 2019

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Simple Interest. Objective: Use the simple interest formula. If someone borrows money, what factors influence how much is paid back?. Principal -. How much was borrowed. Time -. How long it was borrowed for. (in years). Rate -. What interest was charged. (annual % rate).

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Presentation Transcript

Simple Interest Objective: Use the simple interest formula.

If someone borrows money, what factors influence how much is paid back? Principal - How much was borrowed. Time - How long it was borrowed for. (in years) Rate - What interest was charged. (annual % rate) Amount to Payback = Principal + Interest Interest = Principal Rate Time

Joe borrows $200 from the bank at 6% simple interest for 3 years. What interest does he owe, and what is his total balance (amount to payback)? Interest Balance Balance = P + I Balance = 200 + 36 Balance = 236 Balance = $236

Juan invests $5000 in bonds for 6 months at an annual interest rate of 7%. How much interest did he earn, and what is the balance in his account? Interest Balance Balance = P + I Balance = 5000 + 175 Balance = 5175 Balance = $5175

Find the simple interest and the balance. Balance = P + I Balance = 2000 + 60 Balance = $2060

Find the annual simple interest rate.

Find the principal amount invested.

Quick Draw for Points • You will have 60 seconds to solve each problem • The text is Simple Interest Problems

Example 1: Finding Interest on a Loan To buy a car, Jessica borrowed $15,000 for 3 years at an annual simple interest rate of 9%. How much interest will she pay if she pays the entire loan off at the end of the third year? First, find the interest she will pay. I = PrtUse the formula. I = 15,000  0.09 3 Substitute. Use 0.09 for 9%. • I = 4050Solve for I.

Example 1A: Finding Total Payment on a Loan What is the total amount that she will repay? Jessica will pay $4050 in interest. You can find the total amount A to be repaid on a loan by adding the principal P to the interest I. P+ I = Aprincipal + interest = total amount 15,000 + 4050 = ASubstitute. • 19,050 = ASolve for A. Jessica will repay a total of $19,050 on her loan.

Example 2 TJ invested $4000 in a bond at a yearly rate of 2%. He earned $200 in interest. How long was the money invested? I = PrtUse the formula. 200 = 4000  0.02 t Substitute values into the equation. 200 = 80t • 2.5 = tSolve for t. The money was invested for 2.5 years, or 2 years and 6 months.

Example 3 Bertha deposited $1000 into a retirement account when she was 18. How much will Bertha have in this account after 50 years at a yearly simple interest rate of 7.5%? I = PrtUse the formula. I = 1000  0.075  50 Substitute. Use 0.075 for 7.5%. • I = 3750 Solve for I. The interest is $3750. Now you can find the total.

Example 3 Continued P + I = AUse the formula. 1000 + 3750 = A Substitute. • 4750 = ASolve for A. Bertha will have $4750 in the account after 50 years.

Example 4 Mr. Mogi borrowed $9000 for 10 years to make home improvements. If he repaid a total of $20,000 at what interest rate did he borrow the money? P + I = AUse the formula. 9000 + I = 20,000 Substitute. I = 20,000 – 9000 = 11,000 Subtract 9000 from both sides. He paid $11,000 in interest. Use the amount of interest to find the interest rate.

11,000 = rDivide both sides by 90,000. 90,000 0.12 = r Example 4 Continued I = PrtUse the formula. 11,000 = 9000 r10 Substitute. 11,000 = 90,000 rSimplify. Mr. Mogi borrowed the money at an annual rate of about 12.2%.

Summary • I = __________ • P=__________ • r = __________ • t = __________ • A=__________ • Interest Formula: I = ( )( )( ) • Amount Formula: A = ___ + ___

SUMMARY Principal - How much was __________. Time - How _____it was borrowed for. (in_____) Rate - What _______was charged. (annual % rate) Amount to Payback = Principal + Interest Interest = ________ ____ ______

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