-6.55% is the change from 275 to 257
Calculation steps:
[( 257 - 275 ) ÷ 275] x 100 = -6.55%
Formula
Percentage change = [(257 - 275) / 275] x 100
Subtract the new number by the original number
257 - 275 = -18
-18 ÷ 275 = -0.06545454545454546
-0.06545454545454546 x 100 = -6.55%
Example