737.5% is the change from 80 to 670
Calculation steps:
[( 670 - 80 ) ÷ 80] x 100 = 737.5%
Formula
Percentage change = [(670 - 80) / 80] x 100
Subtract the new number by the original number
670 - 80 = 590
590 ÷ 80 = 7.375
7.375 x 100 = 737.5%
Example