5.06% is the change from 257 to 270
Calculation steps:
[( 270 - 257 ) ÷ 257] x 100 = 5.06%
Formula
Percentage change = [(270 - 257) / 257] x 100
Subtract the new number by the original number
270 - 257 = 13
13 ÷ 257 = 0.05058365758754864
0.05058365758754864 x 100 = 5.06%