-55.1% is the change from 490 to 220
Calculation steps:
[( 220 - 490 ) ÷ 490] x 100 = -55.1%
Formula
Percentage change = [(220 - 490) / 490] x 100
Subtract the new number by the original number
220 - 490 = -270
-270 ÷ 490 = -0.5510204081632653
-0.5510204081632653 x 100 = -55.1%