2738.89% is the change from 18 to 511
Calculation steps:
[( 511 - 18 ) ÷ 18] x 100 = 2738.89%
Formula
Percentage change = [(511 - 18) / 18] x 100
Subtract the new number by the original number
511 - 18 = 493
493 ÷ 18 = 27.38888888888889
27.38888888888889 x 100 = 2738.89%