A company produces picture frames for which the variable cost is $13 per picture frame and the fixed costs are $40,000. They will sell the picture frames for $75 each. Let x be the number of picture frames produced and sold. a. Write the total cost TC as a function of the number of picture frames produced and sold. TC=$ b. Write the total revenue TR as a function of the number of picture frames produced and sold. TR=$ c. Write the total net income NI as a function of the number of picture frames produced and sold. NI=$ d. Find the number of picture frames which must be produced and sold to breakeven. The number of picture frames which must be produced and sold to breakeven is Round UP to the nearest whole number of picture frames