518.18% is the change from 99 to 612
Calculation steps:
[( 612 - 99 ) ÷ 99] x 100 = 518.18%
Formula
Percentage change = [(612 - 99) / 99] x 100
Subtract the new number by the original number
612 - 99 = 513
513 ÷ 99 = 5.181818181818182
5.181818181818182 x 100 = 518.18%