The formula for discount calculations is:
Price x .Percentage = discount
Then you subtract the discount from the price.
(Don't forget the decimal).
So, you would do this:
Price x .30 = Discount
Price - Discount
Example:
Let's say you want to buy a pair of trousers for £40 and you are given a 30% discount.
£40 x .30 = £12 discount
£40 - £12 = £28
You would pay £28 after the 30% discount on a £40 pair of trousers.
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Percentage * Original Price = Discount Price 30% * $30 = Discount Price 0.3 or (30/100) * $30 = $9 Discount Price = $9
15.39
25%
29.78% or say about a 30% discount.
The quickest way is to multiply the full price by 0.2 That is the amount of the discount.