Buying a component $($i$.$e$.,$ C$1)$ from Supplier A requires a fixed cost of $$3,000,$ with the variable cost of $$20$ per unit. Buying C$1$ from Supplier B requires a fixed cost of $$5,000,$ and the variable cost is $$15$ per unit. Making C$1$ in$-$house requires a large upfront investment of $$10,000,$ but the variable cost is only $$10$ per unit.