-98.46% is the change from 648 to 10
Calculation steps:
[( 10 - 648 ) ÷ 648] x 100 = -98.46%
Formula
Percentage change = [(10 - 648) / 648] x 100
Subtract the new number by the original number
10 - 648 = -638
-638 ÷ 648 = -0.9845679012345679
-0.9845679012345679 x 100 = -98.46%