-81.48% is the change from 270 to 50
Calculation steps:
[( 50 - 270 ) ÷ 270] x 100 = -81.48%
Formula
Percentage change = [(50 - 270) / 270] x 100
Subtract the new number by the original number
50 - 270 = -220
-220 ÷ 270 = -0.8148148148148148
-0.8148148148148148 x 100 = -81.48%