55.14% is the change from 321 to 498
Calculation steps:
[( 498 - 321 ) ÷ 321] x 100 = 55.14%
Formula
Percentage change = [(498 - 321) / 321] x 100
Subtract the new number by the original number
498 - 321 = 177
177 ÷ 321 = 0.5514018691588785
0.5514018691588785 x 100 = 55.14%