199.4% is the change from 331 to 991
Calculation steps:
[( 991 - 331 ) ÷ 331] x 100 = 199.4%
Formula
Percentage change = [(991 - 331) / 331] x 100
Subtract the new number by the original number
991 - 331 = 660
660 ÷ 331 = 1.9939577039274925
1.9939577039274925 x 100 = 199.4%