103.5% is the change from 257 to 523
Calculation steps:
[( 523 - 257 ) ÷ 257] x 100 = 103.5%
Formula
Percentage change = [(523 - 257) / 257] x 100
Subtract the new number by the original number
523 - 257 = 266
266 ÷ 257 = 1.0350194552529184
1.0350194552529184 x 100 = 103.5%