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# Basic Simple interest

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Basic Simple Interest I = PRT

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### Basic Simple interest

1. 1. Image Purchased by Passy World from Dreamstime.com
2. 2. I=PxRxTWhere:I = the Interest Money created in dollarsP = the “Principal” starting amount of moneyR = the Interest Rate per year (in decimal form)T = the Time the money is Invested, or Borrowed, in Years
3. 3. Interest can be calculated to be paid as Half-Yearly, Quarterly, Monthly, or Daily."T" needs to be entered as a fraction of a year, into I = PRT, because the Interest Rate is in units of years. Half Yearly : T = 1/2 Quarterly : T = 1/4 Monthly : T = 1/12 Daily : T = 1/365
4. 4. Roxanna borrows \$6000 to buy a car at 18.5% pa Simple Interest, to be paid back over 5 years. I = PRT I = \$6 000 x 0.185 x 5 I = \$5 550 Image Purchased by Passy World from Dreamstime.com
5. 5. Roxanna borrows \$6000 to buy a car at 18.5% pa Simple Interest, to be paid back over 5 years.The Total Amount Roxanna has to repay is the original \$6000, plus all of the \$5550 Interest.Total Amount = Principal + Interest = \$6000 + \$5550 = \$11 550
6. 6. “How long does Keith need to invest \$4000, at 3.33% pa, to earn \$800 of Interest money?" I = PRT rearranges to T=I (P x R) T = 800 (4000 x 0.0333) T = 6.006 T = 6 years Image Source: http://www.thelocalloancompany.com.au
7. 7. “What Interest Rate do we require, to get \$10 000 of interest money generated from investing \$20 000 for 3 years ?" I = PRT rearranges to R=I (PxT) R = 10 000 (20 000 x 3) R = 0.166666 R = 16.7% Image Source: http://sklepcukrzyka.pl
8. 8. “Tayla borrowed money on 22% Simple Interest for 1 year to buy some expensive Christmas Presents.When she paid back the Loan a year later, \$440 Interest was charged.What was the original Principal Amount she borrowed?" I = PRT rearranges to P=I (R x T) P = 440 (0.22 x 1) P = \$2000 Image Source: http://static.guim.co.uk