A change from 240 to 320 represents a positive change (increase) of 33.33333333333333% Use the formula found below on this webpage to find the percent change by replacing the given values: Percent change = [(240 - 320) / 240] x 100 = 33.33333333333333 % (increase) Where: 240 is the old value and 320 is the new value. In this case we have a positive change (increase) of 33.33333333333333 percent because the new value is greater than the old value.