34.78% is the change from 644 to 868
Calculation steps:
[( 868 - 644 ) ÷ 644] x 100 = 34.78%
Formula
Percentage change = [(868 - 644) / 644] x 100
Subtract the new number by the original number
868 - 644 = 224
224 ÷ 644 = 0.34782608695652173
0.34782608695652173 x 100 = 34.78%