31.97% is the change from 488 to 644
Calculation steps:
[( 644 - 488 ) ÷ 488] x 100 = 31.97%
Formula
Percentage change = [(644 - 488) / 488] x 100
Subtract the new number by the original number
644 - 488 = 156
156 ÷ 488 = 0.319672131147541
0.319672131147541 x 100 = 31.97%