77.95% is the change from 508 to 904
Calculation steps:
[( 904 - 508 ) ÷ 508] x 100 = 77.95%
Formula
Percentage change = [(904 - 508) / 508] x 100
Subtract the new number by the original number
904 - 508 = 396
396 ÷ 508 = 0.7795275590551181
0.7795275590551181 x 100 = 77.95%