738.75% is the change from 80 to 671
Calculation steps:
[( 671 - 80 ) ÷ 80] x 100 = 738.75%
Formula
Percentage change = [(671 - 80) / 80] x 100
Subtract the new number by the original number
671 - 80 = 591
591 ÷ 80 = 7.3875
7.3875 x 100 = 738.75%
Example