209.69% is the change from 320 to 991
Calculation steps:
[( 991 - 320 ) ÷ 320] x 100 = 209.69%
Formula
Percentage change = [(991 - 320) / 320] x 100
Subtract the new number by the original number
991 - 320 = 671
671 ÷ 320 = 2.096875
2.096875 x 100 = 209.69%