234.34% is the change from 99 to 331
Calculation steps:
[( 331 - 99 ) ÷ 99] x 100 = 234.34%
Formula
Percentage change = [(331 - 99) / 99] x 100
Subtract the new number by the original number
331 - 99 = 232
232 ÷ 99 = 2.3434343434343434
2.3434343434343434 x 100 = 234.34%