To find the unit cost for half an hour at a total cost of $1.75, you first need to determine the cost per hour and then find the cost for half an hour.
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Cost per hour: Since $1.75 is presumably the cost that covers one hour, the cost per hour is $1.75.
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Cost for half an hour: To find the cost for half an hour, you divide the cost per hour by 2: \[ \text{Cost for half an hour} = \frac{1.75}{2} = 0.875 \]
Thus, the unit cost for half an hour at $1.75 is $0.875 (or 87.5 cents).
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