Hiram$$s Lakeside is a popular restaurant located on Lake Washington in Seattle. The restaurant's owner wants to better understand his costs and hired a student intern to conduct an activity$-$based costing study. The intern identified three activities, completed the first$-$stage cost allocations and gathered the activity measure data shown below.

Activity Cost Pool Activity Measure Total Cost Total Activity

Serving a party of diners Number of parties served $ $15,9305,900$ parties

Serving a diner Number of diners served $ $110,88012,600$ diners

Serving drinks Number of drinks ordered $ $30,45010,500$ drinks

The above costs exclude organization$-$sustaining costs such as rent, property taxes, and top$-$management salaries.

Some costs, such as the cost of cleaning the linens that cover the restaurant's tables, vary with the number of parties served. Other costs, such as washing plates and glasses, depend on the number of diners served or the number of drinks served.

Prior to the activity$-$based costing study, the owner knew very little about the restaurant costs. She only knew the total cost for the month $($including organization$-$sustaining costs$)$ was $$180,000$ and $12,000$ diners had been served. Therefore, the average cost per diner was $$15.$

Required:

$1$ and $2.$ According to the activity$-$based costing system, what is the total cost and average cost per diner for serving each of the following parties of diners?

Note: Round your intermediate calculations to $2$ decimal places. Round your Total Cost final answer

a$.$ A party of three diners who order three drinks in total.

b$.$ A party of five diners who do not order any drinks.

c$.$ A party of one diner who orders two drinks.