if the annual rate of simple interest increases from 10% to 12.5% .Then a man’s yearly income from an investment increases by Rs.1250. His principle amount is:	Choose the correct choice from the following answers:
A) Rs,45000	B) Rs.50,000	C) Rs. 60,000	D) Rs.65,000	E) Rs.75,000
Let the sum be Rs.x Then, (x*25/2*1/100) – (x*10*1/100)= 1250   25x-20x = 250000 ;   x=50000   ANSWER:Rs.50,000
<result>B</result>
if the annual rate of simple interest increases from 10% to 12.5% .Then a man’s yearly income from an investment increases by Rs.1250. His principle amount is: