61.31% is the change from 504 to 813
Calculation steps:
[( 813 - 504 ) ÷ 504] x 100 = 61.31%
Formula
Percentage change = [(813 - 504) / 504] x 100
Subtract the new number by the original number
813 - 504 = 309
309 ÷ 504 = 0.6130952380952381
0.6130952380952381 x 100 = 61.31%