328.75% is the change from 80 to 343
Calculation steps:
[( 343 - 80 ) ÷ 80] x 100 = 328.75%
Formula
Percentage change = [(343 - 80) / 80] x 100
Subtract the new number by the original number
343 - 80 = 263
263 ÷ 80 = 3.2875
3.2875 x 100 = 328.75%
Example