61.9% is the change from 504 to 816
Calculation steps:
[( 816 - 504 ) ÷ 504] x 100 = 61.9%
Formula
Percentage change = [(816 - 504) / 504] x 100
Subtract the new number by the original number
816 - 504 = 312
312 ÷ 504 = 0.6190476190476191
0.6190476190476191 x 100 = 61.9%