-20.45% is the change from 528 to 420
Calculation steps:
[( 420 - 528 ) ÷ 528] x 100 = -20.45%
Formula
Percentage change = [(420 - 528) / 528] x 100
Subtract the new number by the original number
420 - 528 = -108
-108 ÷ 528 = -0.20454545454545456
-0.20454545454545456 x 100 = -20.45%