Given data:
The first coordinate on the line is (0, 200).
The second coordinate on the line is (2, 300).
The expression for the equation of the line passing through the given points is,
[tex]\begin{gathered} (y-200)=\frac{300-200}{2-0}(x-0) \\ y-200=50x \\ y=50x+200 \end{gathered}[/tex]
Thus, the equationn of the above line is y=50x+200.
Substitute 20 for x in the above equation.
[tex]\begin{gathered} y=50(20)+200 \\ =1200 \end{gathered}[/tex]
Thus, in 20 months client could save $1200.
