A company produces very unusual CD's for which the variable cost is $13 per CD and the fixed costs are $ 40,000. They will sell the CD's for $ 79 each. Let I be the number of CD's produced and sold. a. Write the total cost TC as a function of the number of CD's produced and sold. TC = $ b. Write the total revenue TR as a function of the number of CD's produced and sold. TR = $ - c. Write the total net income NI as a function of the number of CD's produced and sold. NI = $ d. Find the number of CD's which must be produced and sold to breakeven. The humber of CD's which must be produced and sold to breakeven is Round UP to the nearest whole number of CDs