2677.78% is the change from 18 to 500
Calculation steps:
[( 500 - 18 ) ÷ 18] x 100 = 2677.78%
Formula
Percentage change = [(500 - 18) / 18] x 100
Subtract the new number by the original number
500 - 18 = 482
482 ÷ 18 = 26.77777777777778
26.77777777777778 x 100 = 2677.78%