86.6% is the change from 321 to 599
Calculation steps:
[( 599 - 321 ) ÷ 321] x 100 = 86.6%
Formula
Percentage change = [(599 - 321) / 321] x 100
Subtract the new number by the original number
599 - 321 = 278
278 ÷ 321 = 0.8660436137071651
0.8660436137071651 x 100 = 86.6%