A cooker is sold at a gain of 16%. If it has been sold for

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A cooker is sold at a gain of 16%. If it has been sold for $ 20 more, 20% would have been gained. The cost price of the cooker is

Let the CP of the cooker be $ y.
At 16% gain ,

∴ Initial SP =	116y
	100

Again, SP =			116y	+ 20
			100

∴		116y	+ 20 =	120y
		100		100

⇒ 116y + 2000 = 120y
⇒ 4y = 2000

⇒ y =	2000	= $ 500
	4

We can find required answer with the help of given formula :
Here, a = 16%, R = 20, b = 20%

C.P. =	R × 100
	b - a

C.P. =	20 × 100	= $ 500
	20 - 16