2694.44% is the change from 18 to 503
Calculation steps:
[( 503 - 18 ) ÷ 18] x 100 = 2694.44%
Formula
Percentage change = [(503 - 18) / 18] x 100
Subtract the new number by the original number
503 - 18 = 485
485 ÷ 18 = 26.944444444444443
26.944444444444443 x 100 = 2694.44%