A money lender lent Rs. 1000 at 4% 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.	Choose the correct choice from the following.
A) 3.2  B) 3.75  C) 4  D) 4.25  E) 4.5

Rationale: ( 1000 xtx 4 / 100 ) + ( 1400 xtx 5 / 100 ) = 350 â † ’ t = 3.2 answer a
Answer: A