A merchant purchases a wrist watch for $ 450 and fixes its

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A merchant purchases a wrist watch for $ 450 and fixes its list price in such a way that after allowing a discount of 10%, he earns a profit of 20%. Then the list price of the watch is

Here , Cost Price = $ 450 and discount on marked ( list ) price = 10%
If the marked price of watch be y, then

y ×		90	=	450 × 120
		100		100

⇒ y =	450 × 120	= $ 600
	90