-2.88% is the change from 278 to 270
Calculation steps:
[( 270 - 278 ) ÷ 278] x 100 = -2.88%
Formula
Percentage change = [(270 - 278) / 278] x 100
Subtract the new number by the original number
270 - 278 = -8
-8 ÷ 278 = -0.02877697841726619
-0.02877697841726619 x 100 = -2.88%