2500% is the change from 19 to 494
Calculation steps:
[( 494 - 19 ) ÷ 19] x 100 = 2500%
Formula
Percentage change = [(494 - 19) / 19] x 100
Subtract the new number by the original number
494 - 19 = 475
475 ÷ 19 = 25
25 x 100 = 2500%
Example