213.13% is the change from 99 to 310
Calculation steps:
[( 310 - 99 ) ÷ 99] x 100 = 213.13%
Formula
Percentage change = [(310 - 99) / 99] x 100
Subtract the new number by the original number
310 - 99 = 211
211 ÷ 99 = 2.1313131313131315
2.1313131313131315 x 100 = 213.13%