78.66% is the change from 506 to 904
Calculation steps:
[( 904 - 506 ) ÷ 506] x 100 = 78.66%
Formula
Percentage change = [(904 - 506) / 506] x 100
Subtract the new number by the original number
904 - 506 = 398
398 ÷ 506 = 0.7865612648221344
0.7865612648221344 x 100 = 78.66%