-68.52% is the change from 270 to 85
Calculation steps:
[( 85 - 270 ) ÷ 270] x 100 = -68.52%
Formula
Percentage change = [(85 - 270) / 270] x 100
Subtract the new number by the original number
85 - 270 = -185
-185 ÷ 270 = -0.6851851851851852
-0.6851851851851852 x 100 = -68.52%