-68.15% is the change from 270 to 86
Calculation steps:
[( 86 - 270 ) ÷ 270] x 100 = -68.15%
Formula
Percentage change = [(86 - 270) / 270] x 100
Subtract the new number by the original number
86 - 270 = -184
-184 ÷ 270 = -0.6814814814814815
-0.6814814814814815 x 100 = -68.15%