81.5% is the change from 319 to 579
Calculation steps:
[( 579 - 319 ) ÷ 319] x 100 = 81.5%
Formula
Percentage change = [(579 - 319) / 319] x 100
Subtract the new number by the original number
579 - 319 = 260
260 ÷ 319 = 0.8150470219435737
0.8150470219435737 x 100 = 81.5%