328% is the change from 75 to 321
Calculation steps:
[( 321 - 75 ) ÷ 75] x 100 = 328%
Formula
Percentage change = [(321 - 75) / 75] x 100
Subtract the new number by the original number
321 - 75 = 246
246 ÷ 75 = 3.28
3.28 x 100 = 328%
Example