Question 1099098: by selling an article for RS.390 a shopekeeper gain 20%.Find the cost Price?//
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! let x equal the cost of the product.
390 = x + .20 * x
combine like terms to get 390 = 1.2 * x
divide both sides of this equation by 1.2 to get 390 / 1.2 = x
solve for x to get x = 390 / 1.2 = 325
in essence, you multiplied the cost by 1.2 to get the retail price.
to get back to the cost, you need to divide the retail price by 1.2.
don't forget that 20% means 20 per 100, therefore 20% can be viewed as 20/100 which is equal to .2
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