Originally Posted by

**ajj86** when easy pc sell computers at their normal prices, it makes a profit of 30%. In a sale, normal prices are reduced by 10%. Calculate the percentage profit on a computer sold in the sale? cheers

Well, say Easy PC sells a computer for price x. Then if it makes a profit of 30%, then it can be expressed as 0.30*x. Now, when the normal price is reduced by 10%, it can be expressed as x - 0.10*x = 0.90*x

You can then set up a ratio to determine the profit made when the PC is on sale:

x/.30x = .90x/(y*x) with x denoting original price and y denoting percentage of profit made when PC is on sale.

Cancel out all x's to get:

1/30 = .90/y. Cross multiply to get:

y = 30*.90

y = 0.27

So, when the PC is on sale, Easy PC will make 27% profit on each PC sold.