-55.22% is the change from 938 to 420
Calculation steps:
[( 420 - 938 ) ÷ 938] x 100 = -55.22%
Formula
Percentage change = [(420 - 938) / 938] x 100
Subtract the new number by the original number
420 - 938 = -518
-518 ÷ 938 = -0.5522388059701493
-0.5522388059701493 x 100 = -55.22%