4000 was divided into two parts such a way that when first part was invested at

Question

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%?

Options:

A . Rs.2500

B . Rs.2700

C . Rs.2800

D . Rs.5000

Answer: Option C

(x*3*1)/100 + [(4000 - x)*5*1]/100 = 144

3x/100 + 200 “ 5x/100 = 144

2x/100 = 56 ¨ x = 2800

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