77.82% is the change from 257 to 457
Calculation steps:
[( 457 - 257 ) ÷ 257] x 100 = 77.82%
Formula
Percentage change = [(457 - 257) / 257] x 100
Subtract the new number by the original number
457 - 257 = 200
200 ÷ 257 = 0.7782101167315175
0.7782101167315175 x 100 = 77.82%