4. Consider the following cash flow I Year Cost 1 2 $1,000 $1,000 $1,000 $1,200 3 4 5 $1,200 6 $1,200 If the interest rate is 3% per year, determine (a) The present worth of the cost by using tabulated factors (b) The present worth of the cost by using spreadsheet functions (c) The equivalent annual cost by using tabulated factors (d) The equivalent annual cost by using spreadsheet functions (16 points)