... 6.25% of 80. The number 80 is called the base of the percent. Another way to view this problem is to simply divide 5 by the base, 80, and then multiply the result by 100 to get the percent. ... from 600 to 750, then the percent increase is found by dividing the amount of increase, 150, by the base, 600, which is the first (or the smaller) of the two given numbers, and then multiplying ... from 500 to 400, then the percent decrease is found by dividing the amount of decrease, 100, by the base, 500, which is the first (or the larger) of the two given numbers, and then multiplying...