310.1% is the change from 99 to 406
Calculation steps:
[( 406 - 99 ) ÷ 99] x 100 = 310.1%
Formula
Percentage change = [(406 - 99) / 99] x 100
Subtract the new number by the original number
406 - 99 = 307
307 ÷ 99 = 3.101010101010101
3.101010101010101 x 100 = 310.1%