-7.5% is the change from 240 to 222
Calculation steps:
[( 222 - 240 ) ÷ 240] x 100 = -7.5%
Formula
Percentage change = [(222 - 240) / 240] x 100
Subtract the new number by the original number
222 - 240 = -18
-18 ÷ 240 = -0.075
-0.075 x 100 = -7.5%
Example