-48.36% is the change from 821 to 424
Calculation steps:
[( 424 - 821 ) ÷ 821] x 100 = -48.36%
Formula
Percentage change = [(424 - 821) / 821] x 100
Subtract the new number by the original number
424 - 821 = -397
-397 ÷ 821 = -0.4835566382460414
-0.4835566382460414 x 100 = -48.36%