-73.7% is the change from 270 to 71
Calculation steps:
[( 71 - 270 ) ÷ 270] x 100 = -73.7%
Formula
Percentage change = [(71 - 270) / 270] x 100
Subtract the new number by the original number
71 - 270 = -199
-199 ÷ 270 = -0.737037037037037
-0.737037037037037 x 100 = -73.7%