77.34% is the change from 256 to 454
Calculation steps:
[( 454 - 256 ) ÷ 256] x 100 = 77.34%
Formula
Percentage change = [(454 - 256) / 256] x 100
Subtract the new number by the original number
454 - 256 = 198
198 ÷ 256 = 0.7734375
0.7734375 x 100 = 77.34%