309.09% is the change from 198 to 810
Calculation steps:
[( 810 - 198 ) ÷ 198] x 100 = 309.09%
Formula
Percentage change = [(810 - 198) / 198] x 100
Subtract the new number by the original number
810 - 198 = 612
612 ÷ 198 = 3.090909090909091
3.090909090909091 x 100 = 309.09%