Mohan sold his watch at 10% loss. If he had sold it for

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Mohan sold his watch at 10% loss. If he had sold it for $ 45 more, he would have made 5% profit. The selling price (in $) of the watch was

If the C.P. of watch be $ y,
then

First S.P. =	9y
	10

According to question ,

∴		105y	-	9y	= 45
		100		100

⇒	105y - 90y	= 45
	100

⇒	15y	= 45
	100

⇒ y =	45 × 100	= $ 300
	15

∴ S. P. =	300 × 9	= $ 270
	10

We can find required answer with the help of given formula :
Here, a = 10%, R = $ 45, b = 5%

C.P. =	R × 100
	b + a

C.P. =	4500
	10 + 5

C.P. =	4500	= 300
	15

⇒ S.P. = 300 – 300 ×	10	= $ 270
	100