507.41% is the change from 135 to 820
Calculation steps:
[( 820 - 135 ) ÷ 135] x 100 = 507.41%
Formula
Percentage change = [(820 - 135) / 135] x 100
Subtract the new number by the original number
820 - 135 = 685
685 ÷ 135 = 5.074074074074074
5.074074074074074 x 100 = 507.41%