31.06% is the change from 644 to 844
Calculation steps:
[( 844 - 644 ) ÷ 644] x 100 = 31.06%
Formula
Percentage change = [(844 - 644) / 644] x 100
Subtract the new number by the original number
844 - 644 = 200
200 ÷ 644 = 0.3105590062111801
0.3105590062111801 x 100 = 31.06%