503.7% is the change from 135 to 815
Calculation steps:
[( 815 - 135 ) ÷ 135] x 100 = 503.7%
Formula
Percentage change = [(815 - 135) / 135] x 100
Subtract the new number by the original number
815 - 135 = 680
680 ÷ 135 = 5.037037037037037
5.037037037037037 x 100 = 503.7%