49.22% is the change from 644 to 961
Calculation steps:
[( 961 - 644 ) ÷ 644] x 100 = 49.22%
Formula
Percentage change = [(961 - 644) / 644] x 100
Subtract the new number by the original number
961 - 644 = 317
317 ÷ 644 = 0.4922360248447205
0.4922360248447205 x 100 = 49.22%