81.25% is the change from 480 to 870
Calculation steps:
[( 870 - 480 ) ÷ 480] x 100 = 81.25%
Formula
Percentage change = [(870 - 480) / 480] x 100
Subtract the new number by the original number
870 - 480 = 390
390 ÷ 480 = 0.8125
0.8125 x 100 = 81.25%