155.49% is the change from 319 to 815
Calculation steps:
[( 815 - 319 ) ÷ 319] x 100 = 155.49%
Formula
Percentage change = [(815 - 319) / 319] x 100
Subtract the new number by the original number
815 - 319 = 496
496 ÷ 319 = 1.554858934169279
1.554858934169279 x 100 = 155.49%