Formulas and examples are included. So \$15 + (\$0.45 x 1 day) = \$15.45. ", "I love wikiHow––a solution to my every question. Percentages are used to make car and house payments, calculate tips and pay taxes on goods. You may be asked “what percentage of W is P,” where W is the whole amount and P is the portion amount. What is the percentage? Calculating Percentages Based on Ratios. You can use a calculator to easily work out percentages. 50 x 4 = 200. The amount borrowed was initially \$15 and the interest rate is 3% per day. Do this by subtracting the old value from the new one. To learn how to calculate a discount using a percentage, scroll down! This image may not be used by other entities without the express written consent of wikiHow, Inc.
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