77.6% is the change from 509 to 904
Calculation steps:
[( 904 - 509 ) ÷ 509] x 100 = 77.6%
Formula
Percentage change = [(904 - 509) / 509] x 100
Subtract the new number by the original number
904 - 509 = 395
395 ÷ 509 = 0.7760314341846758
0.7760314341846758 x 100 = 77.6%