Let:
x = Number of timers
The function cost is given by:
[tex]C(x)=50000+7x[/tex]The revenue cost is given by:
[tex]R(x)=13x[/tex]The profit is given by:
[tex]\begin{gathered} P(x)=R(x)-C(x) \\ P(x)=13x-(50000+7x) \\ P(x)=6x-50000 \end{gathered}[/tex](d)
x = 3000
[tex]\begin{gathered} P(3000)=6(3000)-50000 \\ P(3000)=-32000 \end{gathered}[/tex]x = 7000
[tex]\begin{gathered} P(7000)=6(7000)-50000 \\ P(7000)=-8000 \end{gathered}[/tex]x = 10000
[tex]\begin{gathered} P(10000)=6(10000)-50000 \\ P(10000)=10000 \end{gathered}[/tex]