On selling an article for ! 170, a shopkeeper loses 15%. In order to gain 20%, he must sell that article at rupees:
Original S.P. = 170
Loss % = 15%
Let C.P. = $$x$$
=> $$\frac{x - 170}{x} * 100 = 15$$
=> $$17x = 3400 => x = 200$$
Profit % = 20%
=> Profit amount = $$\frac{20}{100}$$ * 200 = 40
New S.P. = 200+40 = 240
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