-2.72% is the change from 257 to 250
Calculation steps:
[( 250 - 257 ) ÷ 257] x 100 = -2.72%
Formula
Percentage change = [(250 - 257) / 257] x 100
Subtract the new number by the original number
250 - 257 = -7
-7 ÷ 257 = -0.027237354085603113
-0.027237354085603113 x 100 = -2.72%