-90.74% is the change from 421 to 39
Calculation steps:
[( 39 - 421 ) ÷ 421] x 100 = -90.74%
Formula
Percentage change = [(39 - 421) / 421] x 100
Subtract the new number by the original number
39 - 421 = -382
-382 ÷ 421 = -0.9073634204275535
-0.9073634204275535 x 100 = -90.74%