-21.03% is the change from 428 to 338
Calculation steps:
[( 338 - 428 ) ÷ 428] x 100 = -21.03%
Formula
Percentage change = [(338 - 428) / 428] x 100
Subtract the new number by the original number
338 - 428 = -90
-90 ÷ 428 = -0.2102803738317757
-0.2102803738317757 x 100 = -21.03%