-39.63% is the change from 270 to 163
Calculation steps:
[( 163 - 270 ) ÷ 270] x 100 = -39.63%
Formula
Percentage change = [(163 - 270) / 270] x 100
Subtract the new number by the original number
163 - 270 = -107
-107 ÷ 270 = -0.3962962962962963
-0.3962962962962963 x 100 = -39.63%