By selling 90 ball pens for $ 160 a person loses 20%. The

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By selling 90 ball pens for $ 160 a person loses 20%. The number of ball pens, which should be sold for $ 96 so as to have a profit of 20% is

Given that , S.P. of 90 ball pens = $ 160
On 20% lose ,

C.P. of 90 ball pens =	100	× S.P.
	100 - Loss%

C.P. of 90 ball pens =	100	× 160 = $ 200
	80

S.P. for a gain of 20% =	200 × 120	= $ 240
	100

∵ $ 240 = 90 ball pens

∴ $ 96 =	90	× 96 = 36
	240