-95.01% is the change from 421 to 21
Calculation steps:
[( 21 - 421 ) ÷ 421] x 100 = -95.01%
Formula
Percentage change = [(21 - 421) / 421] x 100
Subtract the new number by the original number
21 - 421 = -400
-400 ÷ 421 = -0.9501187648456056
-0.9501187648456056 x 100 = -95.01%