-67.78% is the change from 270 to 87
Calculation steps:
[( 87 - 270 ) ÷ 270] x 100 = -67.78%
Formula
Percentage change = [(87 - 270) / 270] x 100
Subtract the new number by the original number
87 - 270 = -183
-183 ÷ 270 = -0.6777777777777778
-0.6777777777777778 x 100 = -67.78%