Computing Average Unit Costs

The total monthly operating costs of Chili To Go are:

$$12,000+$ $$0\mathrm{.}50$X

where X $=$ Number of orders

$($a$)$ Determine the average cost per order at each of the following monthly volumes: $100$; $1,000$; $5,000$; and $10,000.$

$$Round answers to one$$decimal place.

VolumeAverage Unit Cost$100$Answer $11,000$Answer $25,000$Answer $310,000$Answer $4$

$($b$)$ Determine the monthly volume at which the average cost per order is $$0\mathrm{.}70.$

$Answer $5$ orders