61.71% is the change from 504 to 815
Calculation steps:
[( 815 - 504 ) ÷ 504] x 100 = 61.71%
Formula
Percentage change = [(815 - 504) / 504] x 100
Subtract the new number by the original number
815 - 504 = 311
311 ÷ 504 = 0.6170634920634921
0.6170634920634921 x 100 = 61.71%