283.75% is the change from 80 to 307
Calculation steps:
[( 307 - 80 ) ÷ 80] x 100 = 283.75%
Formula
Percentage change = [(307 - 80) / 80] x 100
Subtract the new number by the original number
307 - 80 = 227
227 ÷ 80 = 2.8375
2.8375 x 100 = 283.75%
Example