# math

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by selling 90 computer a shopkeeper gains the amount which is equal to the selling price of 10 computer find the profit percent ? had he purchased them for rupees 30000 each what would have been the selling price of a computer ??

• math -

if he purchases them for p and sells them for s,

90(s-p) = 10s
90s - 90p = 10s
80s = 90p
s = 9/8 p = 1.125p
so profit is 12.5%

9/8 * 30000 = 33750

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