61.58% is the change from 505 to 816
Calculation steps:
[( 816 - 505 ) ÷ 505] x 100 = 61.58%
Formula
Percentage change = [(816 - 505) / 505] x 100
Subtract the new number by the original number
816 - 505 = 311
311 ÷ 505 = 0.6158415841584158
0.6158415841584158 x 100 = 61.58%