-98.95% is the change from 668 to 7
Calculation steps:
[( 7 - 668 ) ÷ 668] x 100 = -98.95%
Formula
Percentage change = [(7 - 668) / 668] x 100
Subtract the new number by the original number
7 - 668 = -661
-661 ÷ 668 = -0.9895209580838323
-0.9895209580838323 x 100 = -98.95%