50.62% is the change from 644 to 970
Calculation steps:
[( 970 - 644 ) ÷ 644] x 100 = 50.62%
Formula
Percentage change = [(970 - 644) / 644] x 100
Subtract the new number by the original number
970 - 644 = 326
326 ÷ 644 = 0.5062111801242236
0.5062111801242236 x 100 = 50.62%