customer contact. let $N$ be the time allocated to new customer service.$)$

Max$1\mathrm{.}2R+N$

$s.t.$

Hours of technician time

Revenue generated

$25R+8N800$

Time spent on customer contact

$R,N0$

$($b$)$ Find the optimal solution. What is the objective value at the optimal solution?

$at(R,N)=()$