512.5% is the change from 80 to 490
Calculation steps:
[( 490 - 80 ) ÷ 80] x 100 = 512.5%
Formula
Percentage change = [(490 - 80) / 80] x 100
Subtract the new number by the original number
490 - 80 = 410
410 ÷ 80 = 5.125
5.125 x 100 = 512.5%
Example