-71.11% is the change from 270 to 78
Calculation steps:
[( 78 - 270 ) ÷ 270] x 100 = -71.11%
Formula
Percentage change = [(78 - 270) / 270] x 100
Subtract the new number by the original number
78 - 270 = -192
-192 ÷ 270 = -0.7111111111111111
-0.7111111111111111 x 100 = -71.11%