750% is the change from 80 to 680
Calculation steps:
[( 680 - 80 ) ÷ 80] x 100 = 750%
Formula
Percentage change = [(680 - 80) / 80] x 100
Subtract the new number by the original number
680 - 80 = 600
600 ÷ 80 = 7.5
7.5 x 100 = 750%
Example