-74.04% is the change from 520 to 135
Calculation steps:
[( 135 - 520 ) ÷ 520] x 100 = -74.04%
Formula
Percentage change = [(135 - 520) / 520] x 100
Subtract the new number by the original number
135 - 520 = -385
-385 ÷ 520 = -0.7403846153846154
-0.7403846153846154 x 100 = -74.04%