55.94% is the change from 320 to 499
Calculation steps:
[( 499 - 320 ) ÷ 320] x 100 = 55.94%
Formula
Percentage change = [(499 - 320) / 320] x 100
Subtract the new number by the original number
499 - 320 = 179
179 ÷ 320 = 0.559375
0.559375 x 100 = 55.94%