-85.6% is the change from 500 to 72
Calculation steps:
[( 72 - 500 ) ÷ 500] x 100 = -85.6%
Formula
Percentage change = [(72 - 500) / 500] x 100
Subtract the new number by the original number
72 - 500 = -428
-428 ÷ 500 = -0.856
-0.856 x 100 = -85.6%
Example