-97.41% is the change from 270 to 7
Calculation steps:
[( 7 - 270 ) ÷ 270] x 100 = -97.41%
Formula
Percentage change = [(7 - 270) / 270] x 100
Subtract the new number by the original number
7 - 270 = -263
-263 ÷ 270 = -0.9740740740740741
-0.9740740740740741 x 100 = -97.41%