291.46% is the change from 82 to 321
Calculation steps:
[( 321 - 82 ) ÷ 82] x 100 = 291.46%
Formula
Percentage change = [(321 - 82) / 82] x 100
Subtract the new number by the original number
321 - 82 = 239
239 ÷ 82 = 2.9146341463414633
2.9146341463414633 x 100 = 291.46%