-89.63% is the change from 270 to 28
Calculation steps:
[( 28 - 270 ) ÷ 270] x 100 = -89.63%
Formula
Percentage change = [(28 - 270) / 270] x 100
Subtract the new number by the original number
28 - 270 = -242
-242 ÷ 270 = -0.8962962962962963
-0.8962962962962963 x 100 = -89.63%