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If the original price is $P and the sale price is $S and the discount rate is still 15%. The discount is $P Ã 0.15 and hence the sale price is given by. $S = $P - $P Ã 0.15 = $P(1 - 0.15) = $P Ã 0.85. Now I hope you can see what to do.f you know the original price and the discount percent you can calculate the sale price. A little algebra then lets you turn this around and calculate the original price if you know the discount percent and the sale price.