97.19% is the change from 320 to 631
Calculation steps:
[( 631 - 320 ) ÷ 320] x 100 = 97.19%
Formula
Percentage change = [(631 - 320) / 320] x 100
Subtract the new number by the original number
631 - 320 = 311
311 ÷ 320 = 0.971875
0.971875 x 100 = 97.19%