Question 3 (9 marks) Part A Stamp Pty. Ltd. is trying to determine the cost behaviour of its monthly mail-stamping costs. The following data are available for the first half of the year: Month Total cost January February March April $440 $400 $500 $490 $470 $415 Mails stamped 2,250 2,050 2,850 2,750 2,450 2,680 May June Required Determine the cost function of the mail-stamping cost using the high low method. (4 marks) Part B The following are the expected costs of a company in a particular period at three different production levels. Units of production output Cost A Cost B Cost C Cost D Cost E 1,000 $1,500 $4.5/unit $4,000 $3/unit $1,000 1,500 $2,250 $3/unit $5,600 $3/unit $1,000 2,000 $3,000 $2.25/unit $7,200 $3/unit $1,000 Required: What kind of cost is each of the five costs above in relation to cost behaviour? State your answer for each cost as Variable, Fixed, Mixed or No particular pattern