-23.5% is the change from 549 to 420
Calculation steps:
[( 420 - 549 ) ÷ 549] x 100 = -23.5%
Formula
Percentage change = [(420 - 549) / 549] x 100
Subtract the new number by the original number
420 - 549 = -129
-129 ÷ 549 = -0.23497267759562843
-0.23497267759562843 x 100 = -23.5%