InterviewSolution
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1). 12 years2). 13 years3). 9 years4). 16 years |
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Answer» ⇒ Let, Principal be Rs. x then Amount = Rs. 2x, RATE = r% and Time (n) = 3 years. ⇒ A = P× [1 + (r/100)]n ⇒ 2x = x × [1 + (r/100)] 3 ⇒ 2 = [1 + (r/100)] 3 ------ 1 ⇒ If SUM become 8 times in the time n years then, ⇒ 8 = [1 + (r/100)] n ⇒ 23 = [1 + (r/100)] n ⇒ putting the value of EQUATION 1 into above we GET, ⇒ ([1 + (r/100)] 3)3 = [1 + (r/100)] n ∴ n = 9 |
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