2460% is the change from 20 to 512
Calculation steps:
[( 512 - 20 ) ÷ 20] x 100 = 2460%
Formula
Percentage change = [(512 - 20) / 20] x 100
Subtract the new number by the original number
512 - 20 = 492
492 ÷ 20 = 24.6
24.6 x 100 = 2460%
Example