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Discount

·       Discount is given on marked price /List Price only
·       There is always gain when discount is given
·         Discount = List price - Selling price or
 Selling price = List price - discount or
 List price = Selling price + discount


Rate of discount = Discount %  × 100


Selling price = List price × 

List price = Selling price × 

Example:
 Find the sale price of an item that has a list price is 24 dollars and a discount rate of 50%

Explanation:
Discount = 24 × 50% = 24 × 0.50 = 12
Sale Price = List Price - Discount = 24 − 12 = 12 dollars. 

Example:
 If Rs. 10 be allowed as true discount on a bill of Rs. 110 due at the end of a certain time, then the discount allowed on the same sum due at the end of double the time is:

Explanation:
S.I. on Rs. (110 - 10) for a certain time = Rs. 10.
S.I. on Rs. 100 for double the time = Rs. 20.
T.D. on Rs. 120 = Rs. (120 - 100) = Rs. 20.
T.D. on Rs. 110 = Rs.20x 110= Rs. 18.33
120

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