208.72% is the change from 321 to 991
Calculation steps:
[( 991 - 321 ) ÷ 321] x 100 = 208.72%
Formula
Percentage change = [(991 - 321) / 321] x 100
Subtract the new number by the original number
991 - 321 = 670
670 ÷ 321 = 2.087227414330218
2.087227414330218 x 100 = 208.72%