15.25% is the change from 223 to 257
Calculation steps:
[( 257 - 223 ) ÷ 223] x 100 = 15.25%
Formula
Percentage change = [(257 - 223) / 223] x 100
Subtract the new number by the original number
257 - 223 = 34
34 ÷ 223 = 0.15246636771300448
0.15246636771300448 x 100 = 15.25%