-21.43% is the change from 280 to 220
Calculation steps:
[( 220 - 280 ) ÷ 280] x 100 = -21.43%
Formula
Percentage change = [(220 - 280) / 280] x 100
Subtract the new number by the original number
220 - 280 = -60
-60 ÷ 280 = -0.21428571428571427
-0.21428571428571427 x 100 = -21.43%