428.75% is the change from 80 to 423
Calculation steps:
[( 423 - 80 ) ÷ 80] x 100 = 428.75%
Formula
Percentage change = [(423 - 80) / 80] x 100
Subtract the new number by the original number
423 - 80 = 343
343 ÷ 80 = 4.2875
4.2875 x 100 = 428.75%
Example