-49.03% is the change from 824 to 420
Calculation steps:
[( 420 - 824 ) ÷ 824] x 100 = -49.03%
Formula
Percentage change = [(420 - 824) / 824] x 100
Subtract the new number by the original number
420 - 824 = -404
-404 ÷ 824 = -0.49029126213592233
-0.49029126213592233 x 100 = -49.03%