-41.71% is the change from 820 to 478
Calculation steps:
[( 478 - 820 ) ÷ 820] x 100 = -41.71%
Formula
Percentage change = [(478 - 820) / 820] x 100
Subtract the new number by the original number
478 - 820 = -342
-342 ÷ 820 = -0.4170731707317073
-0.4170731707317073 x 100 = -41.71%