-71.48% is the change from 270 to 77
Calculation steps:
[( 77 - 270 ) ÷ 270] x 100 = -71.48%
Formula
Percentage change = [(77 - 270) / 270] x 100
Subtract the new number by the original number
77 - 270 = -193
-193 ÷ 270 = -0.7148148148148148
-0.7148148148148148 x 100 = -71.48%