If the annual rate of simple interest increases from 10 % to 12 ½ % a man's an

Question

If the annual rate of simple interest increases from 10 % to 12 ½ % a man's annual income increases by Rs. 1250. The principle is?

Options:

A . Rs. 4500

B . Rs.50000

C . Rs.60000

D . Rs.65000

Answer: Option B

Let the principal be Rs x.
Then
(x Ã— 25/2 Ã— 1/100 Ã— 1) “ (x Ã— 10/100 Ã— 1) = 1250
=> x/8 “ x/10 = 1250
=> 5x - 4x = 50000
=> X = 50000
Hence the principal is Rs 50000

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