By selling 80 ball pens for $ 140 a retailer loses 30%.

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By selling 80 ball pens for $ 140 a retailer loses 30%. How many ball pens should he sell for $ 104 so as to make a profit of 30%?

Here , S.P. of 80 ball pens = $ 140
On 30% loss ,

∴ C.P. of 80 ball pens = S.P. ×	100
	100 - Loss%

C.P. of 80 ball pens = 140 ×	100	= $ 200
	70

For a gain of 30% ,

S.P. =	120 × 130	= $ 260
	100

∴ $ 260 = 80 ball pens

∴ $ 104 =	80	× 104 = 32
	260