407.5% is the change from 80 to 406
Calculation steps:
[( 406 - 80 ) ÷ 80] x 100 = 407.5%
Formula
Percentage change = [(406 - 80) / 80] x 100
Subtract the new number by the original number
406 - 80 = 326
326 ÷ 80 = 4.075
4.075 x 100 = 407.5%
Example