27.8% is the change from 644 to 823
Calculation steps:
[( 823 - 644 ) ÷ 644] x 100 = 27.8%
Formula
Percentage change = [(823 - 644) / 644] x 100
Subtract the new number by the original number
823 - 644 = 179
179 ÷ 644 = 0.2779503105590062
0.2779503105590062 x 100 = 27.8%