-40% is the change from 110 to 66
Calculation steps:
[( 66 - 110 ) ÷ 110] x 100 = -40%
Formula
Percentage change = [(66 - 110) / 110] x 100
Subtract the new number by the original number
66 - 110 = -44
-44 ÷ 110 = -0.4
-0.4 x 100 = -40%
Example