The absolute change is defined as:
[tex]V_2-V_1[/tex]where V1 and V2 are the initial and final values, respectively.
Plugging the values given we have that:
[tex]18-120=-102[/tex]Therefore the absolute change is -102. (The minues sign indicate a decrease)
The percentage change is given by:
[tex]\frac{V_2-V_1}{\lvert V_1\rvert}\cdot100[/tex]plugging the values given we have:
[tex]\frac{18-120}{\lvert120\rvert}\cdot100=-\frac{102}{120}\cdot100=-0.85\cdot100=85[/tex]Therefore the percentage change is -85% (Once again the minus sign indicate a decrease)
