Discounts on purchases can make items more attractive. To determine if they fit in your budget, you need to calculate the price after the discount. The amount that the price drops depends on the original price and the discounted percentage. The ability to quickly enter equations on a calculator saves time and helps you decide if an item is within your price range.

Divide the percentage discount by 100. Enter the percentage off, push the division key, enter "100" and then push the equals sign. For example, if you are calculating a 17 per cent discount, enter "17," push the division sign, enter "100" and push the equals sign to get 0.17.

Subtract the per cent off expressed as a decimal from 1 by entering "1," then pushing the minus sign, entering the percentage expressed as a decimal and then pushing the equals sign. This is the portion of the price remaining after the discount. In this example, you would enter "1," push the minus sign, enter "0.17" and push the equals sign to get 0.83.

Multiply the percentage remaining after the discount by the original price, to find the price after the discount. On the calculator, enter the original price, push the multiplication sign, enter the percentage remaining and push the equals sign to find the price. Finishing the example, if the original price equals £56, you would enter "87," push the multiplication sign, enter "0.83" and then push the equals sign to find the price after the discount, which is £46.9.