870.59% is the change from 68 to 660
Calculation steps:
[( 660 - 68 ) ÷ 68] x 100 = 870.59%
Formula
Percentage change = [(660 - 68) / 68] x 100
Subtract the new number by the original number
660 - 68 = 592
592 ÷ 68 = 8.705882352941176
8.705882352941176 x 100 = 870.59%