To find the unit cost for half an hour at the rate of $1.75, you simply consider the cost of 1 hour.
If 1/2 hour costs $1.75, then the unit cost for 1 hour (which is double that time) would be:
\[ \text{Cost for 1 hour} = 1.75 \times 2 = 3.50 \]
Thus, the unit cost for 1 hour is $3.50. If you want to find the cost per minute, you can divide the cost for 1 hour by 60:
\[ \text{Cost per minute} = \frac{3.50}{60} \approx 0.05833 \]
So, the unit cost per minute is approximately $0.0583, and the unit cost for half an hour (30 minutes) is $1.75.
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