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Sale!
 
Q An online shopping site reduced the price of one computer model by 25 percent for a sale. By what percentage of the sales price must it be increased to put the computer model back at its original price?


 
A Suppose the computer originally cost $100.00. With the 25% deduction, it would cost $75.00. To bring the price back to the original $100.00, you'd have to add $25.00, which is 1/3 of $75 ? or 33.3%.

Source: Cameron,IQ Puzzles,p. 40