400% is the change from 198 to 990
Calculation steps:
[( 990 - 198 ) ÷ 198] x 100 = 400%
Formula
Percentage change = [(990 - 198) / 198] x 100
Subtract the new number by the original number
990 - 198 = 792
792 ÷ 198 = 4
4 x 100 = 400%
Example