333.75% is the change from 80 to 347
Calculation steps:
[( 347 - 80 ) ÷ 80] x 100 = 333.75%
Formula
Percentage change = [(347 - 80) / 80] x 100
Subtract the new number by the original number
347 - 80 = 267
267 ÷ 80 = 3.3375
3.3375 x 100 = 333.75%
Example