320% is the change from 80 to 336
Calculation steps:
[( 336 - 80 ) ÷ 80] x 100 = 320%
Formula
Percentage change = [(336 - 80) / 80] x 100
Subtract the new number by the original number
336 - 80 = 256
256 ÷ 80 = 3.2
3.2 x 100 = 320%
Example