2369.23% is the change from 13 to 321
Calculation steps:
[( 321 - 13 ) ÷ 13] x 100 = 2369.23%
Formula
Percentage change = [(321 - 13) / 13] x 100
Subtract the new number by the original number
321 - 13 = 308
308 ÷ 13 = 23.692307692307693
23.692307692307693 x 100 = 2369.23%