To find the unit cost, you can calculate it based on the time spent and the cost associated with that time.
- Identify the time spent: 1/2 hour (which is 0.5 hours).
- Identify the cost: $1.75.
The unit cost can be calculated as follows:
\[ \text{Unit Cost} = \frac{\text{Total Cost}}{\text{Total Time}} \]
Substituting in the values:
\[ \text{Unit Cost} = \frac{1.75}{0.5} = 3.50 \]
Thus, the unit cost is $3.50 per hour.