The following table shows the number of clients who attended a particular accountancy practice over the last four weeks and the total costs incurred during each of the weeks:
Applying the high low method to the above information, which of the following could be used to forecast total cost ($) from the number of clients expected to attend (where x = the expected number of clients)?
A. 7,280 + 74x
B. 16,080 + 52x
C. 3,200 + 80x
D. 40,000/x