420% is the change from 80 to 416
Calculation steps:
[( 416 - 80 ) ÷ 80] x 100 = 420%
Formula
Percentage change = [(416 - 80) / 80] x 100
Subtract the new number by the original number
416 - 80 = 336
336 ÷ 80 = 4.2
4.2 x 100 = 420%
Example