To calculate the total cost of Troy's order, we can find the cost of each type of meat and cheese individually and then sum them up.
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Calculate the cost of ham: \[ \text{Cost of ham} = 8 \text{ pounds} \times 3.15 \text{ per pound} = 25.20 \]
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Calculate the cost of cheese: \[ \text{Cost of cheese} = 15 \text{ pounds} \times 1.85 \text{ per pound} = 27.75 \]
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Calculate the cost of turkey: \[ \text{Cost of turkey} = 12 \text{ pounds} \times 3.40 \text{ per pound} = 40.80 \]
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Now, sum the total costs: \[ \text{Total cost} = \text{Cost of ham} + \text{Cost of cheese} + \text{Cost of turkey} \] \[ \text{Total cost} = 25.20 + 27.75 + 40.80 = 93.75 \]
Therefore, the total cost of Troy’s order is 93.75.
The correct answer is d. 93.75.