-7.58% is the change from 277 to 256
Calculation steps:
[( 256 - 277 ) ÷ 277] x 100 = -7.58%
Formula
Percentage change = [(256 - 277) / 277] x 100
Subtract the new number by the original number
256 - 277 = -21
-21 ÷ 277 = -0.07581227436823104
-0.07581227436823104 x 100 = -7.58%