A certain sum was invested at a certain rate at simple interest. It took 8 years to quadruple the sum. Find the time it would take to become 10 times itself (in years).A. 18B. 24C. 36D. 30

A certain sum was invested at a certain rate at simple interest. It to

1.	A certain sum was invested at a certain rate at simple interest. It took 8 years to quadruple the sum. Find the time it would take to become 10 times itself (in years).A. 18B. 24C. 36D. 30
Answer» Correct Answer - B Let the sum be Rs. P. It amounted to Rs. 4P in 8 years. S.I. for 8 years = Rs. 3P. Let the rate of interest be R% per annum `3P=((P)(8)(R ))/(100)` `R=(75)/(2)` To become 10 times itself, S.I. must be Rs. 9P. Let the required time be t years. `9P=((P)(t)((75)/(2)))/(100)implies t=24`.

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A certain sum was invested at a certain rate at simple interest. It took 8 years to quadruple the sum. Find the time it would take to become 10 times itself (in years).A. 18B. 24C. 36D. 30

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