56.06% is the change from 198 to 309
Calculation steps:
[( 309 - 198 ) ÷ 198] x 100 = 56.06%
Formula
Percentage change = [(309 - 198) / 198] x 100
Subtract the new number by the original number
309 - 198 = 111
111 ÷ 198 = 0.5606060606060606
0.5606060606060606 x 100 = 56.06%