Question
The time required for a sum of money to amount to five times itself at 16% simple interest p.a. will be
Solution
Let Principal = x Amount = 5x Simple Interest = 5x-x=4x Simple Interest = (P ×R ×T)/100 4x = (x ×16 ×T)/100 T = 25 years. Alternate method: Principal (100) → amount (500) So interst = 500 -100 = 400% @ 16% So time = 400/16 = 25 years
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