90.34% is the change from 321 to 611
Calculation steps:
[( 611 - 321 ) ÷ 321] x 100 = 90.34%
Formula
Percentage change = [(611 - 321) / 321] x 100
Subtract the new number by the original number
611 - 321 = 290
290 ÷ 321 = 0.9034267912772586
0.9034267912772586 x 100 = 90.34%