To gain 8% after allowing a discount of 10%, by what per

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To gain 8% after allowing a discount of 10%, by what per cent cost price should be hiked in the list price?

Let the cost price be $ 100 and marked price be $ y

Then,	y × 90	= 108
	100

⇒	9y	= 108
	10

⇒ y =	108 × 10	= 120
	9

∴ Required percentage = 20%