-47.07% is the change from 820 to 434
Calculation steps:
[( 434 - 820 ) ÷ 820] x 100 = -47.07%
Formula
Percentage change = [(434 - 820) / 820] x 100
Subtract the new number by the original number
434 - 820 = -386
-386 ÷ 820 = -0.47073170731707314
-0.47073170731707314 x 100 = -47.07%