-21.93% is the change from 538 to 420
Calculation steps:
[( 420 - 538 ) ÷ 538] x 100 = -21.93%
Formula
Percentage change = [(420 - 538) / 538] x 100
Subtract the new number by the original number
420 - 538 = -118
-118 ÷ 538 = -0.21933085501858737
-0.21933085501858737 x 100 = -21.93%