-7.22% is the change from 277 to 257
Calculation steps:
[( 257 - 277 ) ÷ 277] x 100 = -7.22%
Formula
Percentage change = [(257 - 277) / 277] x 100
Subtract the new number by the original number
257 - 277 = -20
-20 ÷ 277 = -0.07220216606498195
-0.07220216606498195 x 100 = -7.22%