## Aptitude question and answer on Simple interest

Question : For how many years should Rs. 1200 be invested at 10% p.a. in order to earn the same simple interest as is earned by investing Rs. 1800 at 12% p.a. for 5 years ?
A.    9
B.    10
C.    12
D.    11

S.I required = Rs. $\Bigg({1800 \times 12 \times 5 \over 100} \Bigg)$
Time = $\Bigg({1800 \times 1080 \over 1200 \times10} \Bigg)$years