12.84% is the change from 257 to 290
Calculation steps:
[( 290 - 257 ) ÷ 257] x 100 = 12.84%
Formula
Percentage change = [(290 - 257) / 257] x 100
Subtract the new number by the original number
290 - 257 = 33
33 ÷ 257 = 0.12840466926070038
0.12840466926070038 x 100 = 12.84%