Final answer:
The output of the function cannot be determined without its implementation code. In a hypothetical example, to calculate the total amount including sales tax, multiply the item cost by the tax rate in decimal form, and then add the result to the original cost. For example, $150.00 item with a 10% sales tax would result in a $15.00 tax cost.
Step-by-step explanation:
The output of the function calculateCost and subsequent function call in the question cannot be determined without the actual implementation of the function calculateCost. The function prototype suggests it takes an integer and two pointers to floats, one for the subtotal and one for the tax cost, but without knowing how these are used within the function, we cannot predict what will be printed.
However, judging by the names and usual use of such variables, calculateCost might calculate the total cost of 'count' items and update the values pointed to by 'subTotal' and 'taxCost' respectively. If this were the case, and assuming a certain item cost and tax rate were applied inside the function, the output could resemble one of the options provided. To clarify, let's consider an example outside of this context:
To calculate the total amount paid for an item, including sales tax, one would convert the tax percentage to a decimal and multiply by the item cost. For instance, a $150.00 item with a 10% sales tax would incur:
$150.00 x 0.10 = $15.00 in tax cost
The total amount to pay for the item would then be the sum of the item cost plus the tax cost, so $150.00 + $15.00 = $165.00. Similar calculations would be done for any item cost and tax rate to determine their overall cost after tax.