You work for a company that does blood testing and needs to invest in another centrifuge. You are looking at two different models. The first is the Unico PowerSpin LX which can hold 5 test tubes of blood when operating (per run). The second model is the Benchmark Scientific which can hold 6 test tubes when operating (per run). You charge 7 per test tube, so the Unico PowerSpin LX earns you 35 per run and the Benchmark Scientific earns you 42 per run. The Unico PowerSpin LX costs $676 to purchase and each run costs 10. The Benchmark Scientific costs $859 to purchase and costs 15 per run. a) How many runs will be needed for both machines to generate the same level of profit? b) If the expected number of runs is 10,000, which machine should you buy?

I have to show work on excel program please show me work with explanation.