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To find Principal when Time Interest and Rate are given
To find Principal when Time Interest and Rate are given the rules are.
Interest = (Principal × Rate × Time)/100 Principal = (100 × Interest)/(Rate × Time) For example: 1. Find Principal when Time = 3 years, Interest = $ 600; Rate = 4% p.a. Solution: Time = 3 years, Interest = $ 600, Rate = 4% p.a. Principal = (100 × Interest)/(Rate × Time) = (100 × 600)/(4 × 3) = 60000/12 = 5000 Therefore, Principal (P) = $ 5000. 2. Find Principal when Time = 5 years, Interest = $ 500; Rate = 5% p.a. Solution: Time = 5 years, Interest = $ 500, Rate = 5% p.a. Principal = (100 × Interest)/(Rate × Time) = (100 × 500)/(5 × 5) = 50000/25 = 2000 Therefore, Principal (P) = $ 2000. 3. Find Principal when Time = 4 years, Interest = $ 400; Rate = 5% p.a. Solution: Time = 4 years, Interest = $ 400, Rate = 5% p.a. Principal = (100 × Interest)/(Rate × Time) = (100 × 400)/(5 × 4) = 40000/20 = 2000 Therefore, Principal (P) = $ 2000. Related Links : ● Simple Interest.
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