-46.34% is the change from 820 to 440
Calculation steps:
[( 440 - 820 ) ÷ 820] x 100 = -46.34%
Formula
Percentage change = [(440 - 820) / 820] x 100
Subtract the new number by the original number
440 - 820 = -380
-380 ÷ 820 = -0.4634146341463415
-0.4634146341463415 x 100 = -46.34%