667.44% is the change from 86 to 660
Calculation steps:
[( 660 - 86 ) ÷ 86] x 100 = 667.44%
Formula
Percentage change = [(660 - 86) / 86] x 100
Subtract the new number by the original number
660 - 86 = 574
574 ÷ 86 = 6.674418604651163
6.674418604651163 x 100 = 667.44%