75.49% is the change from 257 to 451
Calculation steps:
[( 451 - 257 ) ÷ 257] x 100 = 75.49%
Formula
Percentage change = [(451 - 257) / 257] x 100
Subtract the new number by the original number
451 - 257 = 194
194 ÷ 257 = 0.754863813229572
0.754863813229572 x 100 = 75.49%