A money lender lent Rs. 800 at 3% per year and Rs. 1400 at 5% per year. The amount should be returned to him when the total interest comes to Rs. 350. Find the number of years.
Choices.
A) 3.5
B) 3.72
C) 4
D) 4.25
E) 4.5

Rationale: ( 800 xtx 3 / 100 ) + ( 1400 xtx 5 / 100 ) = 350 â † ’ t = 3.72 answer b
Answer: B