296.97% is the change from 99 to 393
Calculation steps:
[( 393 - 99 ) ÷ 99] x 100 = 296.97%
Formula
Percentage change = [(393 - 99) / 99] x 100
Subtract the new number by the original number
393 - 99 = 294
294 ÷ 99 = 2.9696969696969697
2.9696969696969697 x 100 = 296.97%