-82.07% is the change from 820 to 147
Calculation steps:
[( 147 - 820 ) ÷ 820] x 100 = -82.07%
Formula
Percentage change = [(147 - 820) / 820] x 100
Subtract the new number by the original number
147 - 820 = -673
-673 ÷ 820 = -0.8207317073170731
-0.8207317073170731 x 100 = -82.07%