Final answer:
To find the unit rate in dollars per hour for On Call, one must divide the total cost by the total hours. The reference provided lists costs increasing linearly from $1 to $25 as hours increase from 1 to 5, respectively. Without complete information for On Call, we refer to this pattern to estimate the cost per hour.
Step-by-step explanation:
The student is asking for the unit rate, in dollars per hour, for a company named On Call. Calculating the unit rate involves dividing the total cost by the number of hours to determine the cost per hour.
Since the student provided only a partial context for On Call's pricing, assuming a linear increase in cost with time, we can refer to a provided reference table that lists costs per hour as increasing by $1 for every additional dollar charged (from $1 per hour to $5 per hour), with corresponding total charges from $1 to $25. (Using the general pricing as $1, $4, $9, $16, and $25, respectively, as costs for 1, 2, 3, 4, 5 hours, etc.).
To calculate the unit rate, we can use the provided total costs and the number of hours associated with each cost. For example, at $4 total cost, if that were for 2 hours, the unit rate is $2 per hour. If we look at a higher total cost, such as $9 for 3 hours, the unit rate is $3 per hour. This is derived by dividing the total cost by the total hours (Cost/hours = Rate).
The marginal cost of labor has been mentioned as $1, but without further context, this information cannot be directly related to calculating the unit rate for the specific scenario without additional details.
When attempting to calculate the unit rate for On Call with incomplete data, we must either refer to complete pricing information provided by the student or the pattern outlined in the reference table.