55.45% is the change from 321 to 499
Calculation steps:
[( 499 - 321 ) ÷ 321] x 100 = 55.45%
Formula
Percentage change = [(499 - 321) / 321] x 100
Subtract the new number by the original number
499 - 321 = 178
178 ÷ 321 = 0.5545171339563862
0.5545171339563862 x 100 = 55.45%