108.72% is the change from 321 to 670
Calculation steps:
[( 670 - 321 ) ÷ 321] x 100 = 108.72%
Formula
Percentage change = [(670 - 321) / 321] x 100
Subtract the new number by the original number
670 - 321 = 349
349 ÷ 321 = 1.087227414330218
1.087227414330218 x 100 = 108.72%