331.31% is the change from 99 to 427
Calculation steps:
[( 427 - 99 ) ÷ 99] x 100 = 331.31%
Formula
Percentage change = [(427 - 99) / 99] x 100
Subtract the new number by the original number
427 - 99 = 328
328 ÷ 99 = 3.313131313131313
3.313131313131313 x 100 = 331.31%