2794.44% is the change from 18 to 521
Calculation steps:
[( 521 - 18 ) ÷ 18] x 100 = 2794.44%
Formula
Percentage change = [(521 - 18) / 18] x 100
Subtract the new number by the original number
521 - 18 = 503
503 ÷ 18 = 27.944444444444443
27.944444444444443 x 100 = 2794.44%