2850% is the change from 18 to 531
Calculation steps:
[( 531 - 18 ) ÷ 18] x 100 = 2850%
Formula
Percentage change = [(531 - 18) / 18] x 100
Subtract the new number by the original number
531 - 18 = 513
513 ÷ 18 = 28.5
28.5 x 100 = 2850%
Example