-49.15% is the change from 820 to 417
Calculation steps:
[( 417 - 820 ) ÷ 820] x 100 = -49.15%
Formula
Percentage change = [(417 - 820) / 820] x 100
Subtract the new number by the original number
417 - 820 = -403
-403 ÷ 820 = -0.49146341463414633
-0.49146341463414633 x 100 = -49.15%