-40.37% is the change from 270 to 161
Calculation steps:
[( 161 - 270 ) ÷ 270] x 100 = -40.37%
Formula
Percentage change = [(161 - 270) / 270] x 100
Subtract the new number by the original number
161 - 270 = -109
-109 ÷ 270 = -0.40370370370370373
-0.40370370370370373 x 100 = -40.37%