313.13% is the change from 99 to 409
Calculation steps:
[( 409 - 99 ) ÷ 99] x 100 = 313.13%
Formula
Percentage change = [(409 - 99) / 99] x 100
Subtract the new number by the original number
409 - 99 = 310
310 ÷ 99 = 3.1313131313131315
3.1313131313131315 x 100 = 313.13%