InterestPractise using the formulas for simple interest and compound interest. 
This is level 1; Simple Interest. Give all of your answers to two decimal places. You can earn a trophy if you get at least 9 correct and you do this activity online.
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Level 1  Simple Interest
Level 2  Compound Interest
Level 3  Exam Style Questions
Simple interest: I = P × R ÷ 100 × T
Compound interest: I = P(1 + R ÷ 100)^{T} − P
I is the amount of interest earned by the investment.
P is the principal, the amount originally invested.
R is the rate of interest expressed as a percentage.
T is the number of years the amount was invested for.
If you are following a syllabus that allows the use of a graphic display calculator you could use the Finance Solver to help calculate answers for the compound interest questions.
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