41.74% is the change from 321 to 455
Calculation steps:
[( 455 - 321 ) ÷ 321] x 100 = 41.74%
Formula
Percentage change = [(455 - 321) / 321] x 100
Subtract the new number by the original number
455 - 321 = 134
134 ÷ 321 = 0.4174454828660436
0.4174454828660436 x 100 = 41.74%