-96.06% is the change from 660 to 26
Calculation steps:
[( 26 - 660 ) ÷ 660] x 100 = -96.06%
Formula
Percentage change = [(26 - 660) / 660] x 100
Subtract the new number by the original number
26 - 660 = -634
-634 ÷ 660 = -0.9606060606060606
-0.9606060606060606 x 100 = -96.06%