-19.09% is the change from 220 to 178
Calculation steps:
[( 178 - 220 ) ÷ 220] x 100 = -19.09%
Formula
Percentage change = [(178 - 220) / 220] x 100
Subtract the new number by the original number
178 - 220 = -42
-42 ÷ 220 = -0.19090909090909092
-0.19090909090909092 x 100 = -19.09%