7% is the change from 257 to 275
Calculation steps:
[( 275 - 257 ) ÷ 257] x 100 = 7%
Formula
Percentage change = [(275 - 257) / 257] x 100
Subtract the new number by the original number
275 - 257 = 18
18 ÷ 257 = 0.07003891050583658
0.07003891050583658 x 100 = 7%