In a certain time, the ratio of a certain principal and the simple interest obtained from it are in the ratio 10 : 3 at 10% interest per annum. The number of years the money was invested is
Options:
A .  3 years
B .  1 year
C .  7 years
D .  5 years
Answer: Option A Answer: (a)Using Rule 1,Time = $\text"S.I. × 100"/ \text"Principal × Rate"$= $3/10 × 100/10$ = 3 years
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