7900% is the change from 1 to 80
Calculation steps:
[( 80 - 1 ) ÷ 1] x 100 = 7900%
Formula
Percentage change = [(80 - 1) / 1] x 100
Subtract the new number by the original number
80 - 1 = 79
79 ÷ 1 = 79
79 x 100 = 7900%
Example