3. A CNC milling machine was acquired for $40 000 while trading-in your used one for $15 000. The difference is to be refinanced over a period of 36 months with a 2.99%/year interests, compounded monthly. Draw the cash flow diagram for this problem. 4. Consider the purchase of two robots. The salvage value and annual and maintained costs are listed below. Suppose you sell the robots after 5 years for the vale listed in the "salvage" row and assume that the interest rate is 5%, compounded annually. Would you buy robot 1 or robot 2? Draw the cash flow diagram for this problem. Lathe 1 Lathe 2 Initial cost $55 000 $48 000 Annual MC $5 000 $6 500 Salvage $8 000@5yr $6 000@5yr