In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit?	Choose the correct choice from the following answers.
A) 30%
B) 70 percent
C) 100%
D) 120%
E) None
Solution   Let C.P. = Rs. 100.	Then, Profit = Rs.320,   S.P. = 420.   Let C.P. = Rs. 125% of Rs. 100	= Rs.125.   New S.P. = Rs.420.   Profit = Rs. (420 - 125)	= Rs.295.   ∴ Required percentage	= (295 / 420 x 100)%   = 1475 / 21%   = 70%.   Answer 70 percent
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In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit?