4000 was divided into two parts such a way that when first part was invested at 3% and the second at 5%, the whole annual interest from both the investments is Rs.144, how much was put at 3%?	Choices
A) rs . 2500 B) rs . 2700 C) rs . 2800 D) rs . 5000 E) rs . 6000

Rationale: explanation : ( x * 3 * 1 ) / 100 + [ ( 4000 - x ) * 5 * 1 ] / 100 = 144 3 x / 100 + 200 â € “ 5 x / 100 = 144 2 x / 100 = 56 ã ¨ x = 2800 answer is c
Answer: C