55.31% is the change from 320 to 497
Calculation steps:
[( 497 - 320 ) ÷ 320] x 100 = 55.31%
Formula
Percentage change = [(497 - 320) / 320] x 100
Subtract the new number by the original number
497 - 320 = 177
177 ÷ 320 = 0.553125
0.553125 x 100 = 55.31%