81.31% is the change from 321 to 582
Calculation steps:
[( 582 - 321 ) ÷ 321] x 100 = 81.31%
Formula
Percentage change = [(582 - 321) / 321] x 100
Subtract the new number by the original number
582 - 321 = 261
261 ÷ 321 = 0.8130841121495327
0.8130841121495327 x 100 = 81.31%