55% is the change from 320 to 496
Calculation steps:
[( 496 - 320 ) ÷ 320] x 100 = 55%
Formula
Percentage change = [(496 - 320) / 320] x 100
Subtract the new number by the original number
496 - 320 = 176
176 ÷ 320 = 0.55
0.55 x 100 = 55%
Example