2777.78% is the change from 18 to 518
Calculation steps:
[( 518 - 18 ) ÷ 18] x 100 = 2777.78%
Formula
Percentage change = [(518 - 18) / 18] x 100
Subtract the new number by the original number
518 - 18 = 500
500 ÷ 18 = 27.77777777777778
27.77777777777778 x 100 = 2777.78%