1.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 XType Y
First cost, ($): -7,650-12,900
Maintenance cost, $/year: -1,200 -900
Salvage value, $: 0 2,000
Life, years: 2 4
Type XType Y
First cost, ($): -7,650-12,900
Maintenance cost, $/year: -1,200 -900
Salvage value, $: 0 2,000
Life, years: 2 4