342.5% is the change from 80 to 354
Calculation steps:
[( 354 - 80 ) ÷ 80] x 100 = 342.5%
Formula
Percentage change = [(354 - 80) / 80] x 100
Subtract the new number by the original number
354 - 80 = 274
274 ÷ 80 = 3.425
3.425 x 100 = 342.5%
Example