-29.55% is the change from 220 to 155
Calculation steps:
[( 155 - 220 ) ÷ 220] x 100 = -29.55%
Formula
Percentage change = [(155 - 220) / 220] x 100
Subtract the new number by the original number
155 - 220 = -65
-65 ÷ 220 = -0.29545454545454547
-0.29545454545454547 x 100 = -29.55%