-7.56% is the change from 238 to 220
Calculation steps:
[( 220 - 238 ) ÷ 238] x 100 = -7.56%
Formula
Percentage change = [(220 - 238) / 238] x 100
Subtract the new number by the original number
220 - 238 = -18
-18 ÷ 238 = -0.07563025210084033
-0.07563025210084033 x 100 = -7.56%