89.72% is the change from 321 to 609
Calculation steps:
[( 609 - 321 ) ÷ 321] x 100 = 89.72%
Formula
Percentage change = [(609 - 321) / 321] x 100
Subtract the new number by the original number
609 - 321 = 288
288 ÷ 321 = 0.897196261682243
0.897196261682243 x 100 = 89.72%