If the annual rate of simple interest increases from 10% to 12 1/2 %, a man's y

Question

If the annual rate of simple interest increases from 10% to 12 1/2 %, a man's yearly income increases by Rs. 1250. His principal in Rs. is?

Options:

A . 45000

B . 50000

C . 60000

D . 65000

Answer: Option B

Let the sum be Rs. x. Then,(x * 25/2 * 1/100) - (x * 10 * 1)/100 = 125025x - 20x = 250000x = 50000

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