90.91% is the change from 319 to 609
Calculation steps:
[( 609 - 319 ) ÷ 319] x 100 = 90.91%
Formula
Percentage change = [(609 - 319) / 319] x 100
Subtract the new number by the original number
609 - 319 = 290
290 ÷ 319 = 0.9090909090909091
0.9090909090909091 x 100 = 90.91%