540% is the change from 80 to 512
Calculation steps:
[( 512 - 80 ) ÷ 80] x 100 = 540%
Formula
Percentage change = [(512 - 80) / 80] x 100
Subtract the new number by the original number
512 - 80 = 432
432 ÷ 80 = 5.4
5.4 x 100 = 540%
Example