397.99% is the change from 199 to 991
Calculation steps:
[( 991 - 199 ) ÷ 199] x 100 = 397.99%
Formula
Percentage change = [(991 - 199) / 199] x 100
Subtract the new number by the original number
991 - 199 = 792
792 ÷ 199 = 3.979899497487437
3.979899497487437 x 100 = 397.99%