-86.54% is the change from 520 to 70
Calculation steps:
[( 70 - 520 ) ÷ 520] x 100 = -86.54%
Formula
Percentage change = [(70 - 520) / 520] x 100
Subtract the new number by the original number
70 - 520 = -450
-450 ÷ 520 = -0.8653846153846154
-0.8653846153846154 x 100 = -86.54%