First place the price of your object on the calculator, such as $17.79.
Next you multiply it by thepercentage of discount, such as $17.79 by 20% of discount, if your calculator has this symbol % click it after you place your percentage of discount. Next you click the minus button -. Finally press the equal sign and that is the of 20% of discount from $17.79.
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The only practical reason to calculate the discount is as an intermediate step in determining the new price.
The quickest way is to multiply the full price by 0.2 That is the amount of the discount.
That means that there is a discount (a price reduction, compared to the "official" price), and that this reduction is calculate as a percentage of the total price.
Cp = sp/d
The future amount itself and a discount rate.