90.03% is the change from 321 to 610
Calculation steps:
[( 610 - 321 ) ÷ 321] x 100 = 90.03%
Formula
Percentage change = [(610 - 321) / 321] x 100
Subtract the new number by the original number
610 - 321 = 289
289 ÷ 321 = 0.9003115264797508
0.9003115264797508 x 100 = 90.03%