department and the production department concerning a special$-$order product, TC$-1.$ TC$-1$ is a seasonal product that is manufactured in batches of $2,180$ units. It is sold at cost plus a markup of $30\%.$The sales department is unhappy because fluctuating unit production costs significantly affect selling prices. Sales personnel complain that this has caused excessive customer complaints and the loss of considerable orders for TC$-1.$The production department maintains that each job order must be fully costed on the basis of the costs incurred during the period in which the goods are produced. Production personnel maintain that the only real solution to the problem is for the sales department to increase sales in the slack periods.Margaret Moore, president of the company, asks you as the company accountant to collect quarterly data on TC$-1$ for the past year.From the cost accounting system, you accumulate the following production quantity and cost data:QuarterCosts$1234$Direct materials$$109\mathrm{.}000$$$239,800$$$87,200$$$218,000$Direct labour$65,400143,88052\mathrm{.}320130,800$Manufacturing overhead$114\mathrm{.}450166,770105,730136,250$Total$$288,850$$$550,450$$$245,250485,050$Production in batches$1110$Unit cost $($per batch$)$$$57,770$$$50,041$$$61,313$$$48,505$