$4.)$ You are evaluating two machines. Machine A has an initial cost of $$340,000$ and then an

annual operating cost of $$30,000$ per year for its $5-$year life. Machine $B$ has an initial cost of

$$210,000$ and then annual operating costs of $$90,000$ per year for its $3-$year life. Your discount

rate is $11\%.$

a$)$ Which machine would you select if you did not have to replace the machine at the end of its

life?

b$)$ Which machine would you select if you did have to replace it$?$