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cost price, selling price, profit

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cost price, selling price, profit

by leonswati » Tue May 01, 2012 6:42 am
I bought certain number of oranges at three for a dollar and five sixth of that number at four for a dollar. If I sold all my oranges at 16 for six dollars, I would make a profit of three and a half dollars. How many oranges did I buy?

Can someone help me do solve it?
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by aneesh.kg » Tue May 01, 2012 6:47 am
Let the initial number of oranges be x.

Cost of x oranges = x.(1/3) = x/3
('three for a dollar' means that the price of one orange is 1/3)

Cost of 5/6th of x oranges = (5/6x)*(1/4) = 5x/24

Total Cost Price, CP = x/3 + 5x/24 = 13x/24

Total Selling Price, SP = ( x + 5x/6)*(6/16)
=(11x/6)*(3/8) = 11x/16

SP - CP = 11x/16 - 13x/24 = 7x/48 = 7/2 (Given)

x = 24
You bought 24 oranges.
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