Question 2 (10 marks) A mechanical engineer is considering two types of pressure sensors for a low pressure steam line. The costs are shown below. Which should be selected based on an annual worth comparison at an interest rate of 12% per year? Type X -7,650 2.900 Type Y First cost, $ Maintenance cost, $/year1.200 Salvage value, $ Life, years -900 2.000 Question 3 (15 marks) The machines shown below are under consideration for an improvement to an automated candy bar wrapping process. Determine which should be selected on the basis of an annual worth analysis using an interest rate of 15% per vear. Machine C Machine D -40.000 -65,000 -12,000 First cost, $ Annual cost, S/year -1 Salvage value, S Life, years year-10.000 12.000 25,000 Question 4 (15 marks) Two mutually exclusive projects have the estimated cash flows shown below. Use an annual worth analysis to determine which should be selected at an interest rate of 10% per year Project O Project R First cost, S Annual cost -42.000 -80,000 -6,000-7,000 year 1, increasing S/year Salvage value, $ Life, years by $1000 per year 0 4.000