27.78% is the change from 504 to 644
Calculation steps:
[( 644 - 504 ) ÷ 504] x 100 = 27.78%
Formula
Percentage change = [(644 - 504) / 504] x 100
Subtract the new number by the original number
644 - 504 = 140
140 ÷ 504 = 0.2777777777777778
0.2777777777777778 x 100 = 27.78%