-85.79% is the change from 570 to 81
Calculation steps:
[( 81 - 570 ) ÷ 570] x 100 = -85.79%
Formula
Percentage change = [(81 - 570) / 570] x 100
Subtract the new number by the original number
81 - 570 = -489
-489 ÷ 570 = -0.8578947368421053
-0.8578947368421053 x 100 = -85.79%