67.74% is the change from 31 to 52
Calculation steps:
[( 52 - 31 ) ÷ 31] x 100 = 67.74%
Formula
Percentage change = [(52 - 31) / 31] x 100
Subtract the new number by the original number
52 - 31 = 21
21 ÷ 31 = 0.6774193548387096
0.6774193548387096 x 100 = 67.74%