Rs.7800 is divided into two parts such that if one part be invested at 3% and the other at 5%, the annual interest from both the investments is Rs. 320. Find each part.
Let the amount lent at 3% rate = Rs. x. Then, amount lent at 5% rate = 7800 - x So, => 3% of x + 5% of (7800 - x) = 320 => 5% of 7800 – 2% of x = 320 => 390 – 2% of x = 320 => 2% of x = 70 => x = (70/2) × 100 => x = Rs. 3500 Amount lent at 3% rate = Rs. 3500 Amount lent at 5% rate = 7800 – 3500 = Rs.4300
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