SOLUTION: A store had a 4gigabyte flash on sale with 40% off for $18.90, how much was it prior to the sale price. Please explained the equation

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Question 335119: A store had a 4gigabyte flash on sale with 40% off for $18.90, how much was it prior to the sale price. Please explained the equation
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
18.90/.60=31.50
the sale price is 60% of the retail price, the discount is 40%.