It is usually seen that the retailers cannot sell defective items, old items, etc at the retail-selling price. If these items are sold at lower price, then it is called sale price.
 The difference between marked price (selling price) and the sale price, is called discount.
In other words, a reduction in the price of an article for payment in cash is called discount.
Hence 
Discount is usually given as a percentage of the original price.
Example:
A watch priced at Rs.160 is sold for Rs.140. Find percentage discount.
Solution:
Let Marked Price = Rs.160
Sale Price = Rs.140
Discount = Marked Price – Sale Price = 160 – 140 = Rs.20
Percentage Discount =  x 100 = 
Example:
The marked price of a machine is Rs.600. A discount of 6% is given during a sale. What is the sale price of the washing machine.
Solution:
Let Marked Price = Rs.600
Discount Rate = 6%
Discount = 6% of the marked price =  x 600 = Rs.36
 Sale Price = Marked Price – Discount = 600 – 36 = Rs.564
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