2475% is the change from 20 to 515
Calculation steps:
[( 515 - 20 ) ÷ 20] x 100 = 2475%
Formula
Percentage change = [(515 - 20) / 20] x 100
Subtract the new number by the original number
515 - 20 = 495
495 ÷ 20 = 24.75
24.75 x 100 = 2475%
Example