1) Simple interest on Rs. 500 for 4 years at 6.25% per annum is equal to the simple interest on Rs. 400 at 5% per annum for a certain period of time. The period of time is A) 4 Yrs B) 5 Yrs C) $8\frac{2}{3}$ Yrs D) $6\frac{1}{4}$ Yrs E) $8\frac{1}{4}$ Yrs Answer: Option DExplanation:Period of time be $N$ Given $\frac{(400\times 5\times N)}{100}$ $=\frac{(500\times 4\times 6.25)}{100}$ $\Rightarrow N=\frac{25}{4}$ $=6\frac{1}{4}$ Yrs
