-48.9% is the change from 820 to 419
Calculation steps:
[( 419 - 820 ) ÷ 820] x 100 = -48.9%
Formula
Percentage change = [(419 - 820) / 820] x 100
Subtract the new number by the original number
419 - 820 = -401
-401 ÷ 820 = -0.48902439024390243
-0.48902439024390243 x 100 = -48.9%