231.31% is the change from 99 to 328
Calculation steps:
[( 328 - 99 ) ÷ 99] x 100 = 231.31%
Formula
Percentage change = [(328 - 99) / 99] x 100
Subtract the new number by the original number
328 - 99 = 229
229 ÷ 99 = 2.313131313131313
2.313131313131313 x 100 = 231.31%