663.75% is the change from 80 to 611
Calculation steps:
[( 611 - 80 ) ÷ 80] x 100 = 663.75%
Formula
Percentage change = [(611 - 80) / 80] x 100
Subtract the new number by the original number
611 - 80 = 531
531 ÷ 80 = 6.6375
6.6375 x 100 = 663.75%
Example