1) The compound interest on Rs. 1800 at a10% per annum, for certain period of time is Rs. 378. Find the same time in years. A) 2 Yrs B) 3 Yrs C) 5 yrs D) 4 Yrs E) $2\frac{1}{2}$ Yrs Answer: Option AExplanation:$P=1800$, $CI=378$ Time $=N$ $A$ $=1800+378$ $=2178$ $2178$ $=1800\left(1+\frac{10}{100}\right)^{N}$ N = 2 yrs
