The original price of the computer is $600
During the sale, the computer is 15% cheaper. This means that the computer is selling at 85% (100 - 15%) of its original price.
In order to determine the answer to the question, the following information would be needed :
The formula that can be used to determine the original price of the computer is : sales price / percentage of the original price
$510 / 85%
$510 / 0.85
= $600
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