-55.27% is the change from 939 to 420
Calculation steps:
[( 420 - 939 ) ÷ 939] x 100 = -55.27%
Formula
Percentage change = [(420 - 939) / 939] x 100
Subtract the new number by the original number
420 - 939 = -519
-519 ÷ 939 = -0.5527156549520766
-0.5527156549520766 x 100 = -55.27%