Subtract the new value from the original value. So if that dress is on sale for 25 percent off you have. To determine the percentage we have to divide the value by the total value and then multiply the resultant to 100.
Written using the formula.
Presenting your answer as 87 or 87 percent is acceptable. Note that this is the opposite of finding percent change using the standard equation. Simply a percentage is a fraction whose denominator is 100. OR write the percentage as a decimal fraction for example 20 02.