33.07% is the change from 257 to 342
Calculation steps:
[( 342 - 257 ) ÷ 257] x 100 = 33.07%
Formula
Percentage change = [(342 - 257) / 257] x 100
Subtract the new number by the original number
342 - 257 = 85
85 ÷ 257 = 0.33073929961089493
0.33073929961089493 x 100 = 33.07%