A person borrowed 1,200 at 8% per annual and Rs. 1,800 at 10% per annum, as simple interest for the same period. He had to pay Rs. 1380 in all as interest. Find the time? (in year)

A. 4 years

B. 5 years

C. 6 years

D. 10 years

Answer: Option B

Solution(By Examveda Team)

$$\eqalign{ & \frac{{1200 \times t \times 8}}{{100}} + \frac{{1800 \times t \times 10}}{{100}} = 1380 \cr & 96t + 180t = 1380 \cr & 276t = 1380 \cr & t = 5 \cr} $$