Arif incurred a loss of 25% by selling a used mobile phone set at taka 1500. How much could he gain/lose by selling that 2200 taka ?

A 10% loss
B 20% gain
C 10% gain
D 20% loss

Correct Answer: 10% gain

Let the original price be A. Then,  A - 25% of A = 1500 or,  A - 0.25A = 1500 or,  0.75A = 1500 or,  A = 1500/0.75 = 2000 TK Gain = (2200 - 2000)/2000 × 100% = 10%
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