675% is the change from 80 to 620
Calculation steps:
[( 620 - 80 ) ÷ 80] x 100 = 675%
Formula
Percentage change = [(620 - 80) / 80] x 100
Subtract the new number by the original number
620 - 80 = 540
540 ÷ 80 = 6.75
6.75 x 100 = 675%
Example