-98.96% is the change from 670 to 7
Calculation steps:
[( 7 - 670 ) ÷ 670] x 100 = -98.96%
Formula
Percentage change = [(7 - 670) / 670] x 100
Subtract the new number by the original number
7 - 670 = -663
-663 ÷ 670 = -0.9895522388059701
-0.9895522388059701 x 100 = -98.96%