Question at position 15 Two functions for calculating the total cost and the change given in a transaction are provided. If the missing lines are filled in correctly, the program should prompt the user to input the cost of an item, the quantity, and the amount paid, and then display the change that should be returned. [table]
1 def total_cost(item_cost: float, quantity: int) - float:2 return item_cost * quantity3 4 def change_given(payment: float, total_cost: float) - float:5 return payment - total_cost6 7 def main():8 item_cost = float(input('Enter the cost of the item: '))9 quantity = int(input('Enter the quantity of the items: '))10 payment = float(input('Enter the payment amount: '))11 12 result_1 = # ( code WILL go here )13 result_2 = # ( code WILL go here )14 15 print(f'Total cost: {result_1:.2f}')16 print(f'Change due: {result_2:.2f}')17 18 main()
[/table] Which of the following options is the correct missing code? (Code filled in has been bolded.) 12 result_1 = total_cost(payment, quantity)13 result_2 = change_given(quantity, payment)12 result_1 = change_given(payment, item_cost)13 result_2 = total_cost(quantity, item_cost)12 result_1 = change_given(item_cost, payment)13 result_2 = total_cost(result_1, quantity)12 result_1 = total_cost(item_cost, quantity)13 result_2 = change_given(payment, result_1)Clear my selection

Question

Question at position 15 Two functions for calculating the total cost and the change given in a transaction are provided. If the missing lines are filled in correctly, the program should prompt the user to input the cost of an item, the quantity, and the amount paid, and then display the change that should be returned. [table]
1  def total_cost(item_cost: float, quantity: int) -> float:2 return item_cost * quantity3 4  def change_given(payment: float, total_cost: float) -> float:5 return payment - total_cost6 7  def main():8 item_cost = float(input('Enter the cost of the item: '))9 quantity = int(input('Enter the quantity of the items: '))10 payment = float(input('Enter the payment amount: '))11 12 result_1 = # ( code WILL go here )13 result_2 = # ( code WILL go here )14 15 print(f'Total cost: {result_1:.2f}')16 print(f'Change due: {result_2:.2f}')17 18 main()
[/table] Which of the following options is the correct missing code? (Code filled in has been bolded.) 12 result_1 = total_cost(payment, quantity)13 result_2 = change_given(quantity, payment)12 result_1 = change_given(payment, item_cost)13 result_2 = total_cost(quantity, item_cost)12 result_1 = change_given(item_cost, payment)13 result_2 = total_cost(result_1, quantity)12 result_1 = total_cost(item_cost, quantity)13 result_2 = change_given(payment, result_1)Clear my selection

BlackTom AI · Accepted Answer

We start by understanding what the program is supposed to do: it defines two functions, total_cost(item_cost, quantity) -> item_cost * quantity and change_given(payment, total_cost) -> payment - total_cost, then in main it collects item_cost, quantity, and payment, computes two results, and prints Total cost and Change due. The missing lines correspond to filling result_1 with the total cost and result_2 with the change, using the correct function calls and argument order.

Option A:
12          result_1 = total_cost(payment, quantity)
13          result_2 = change_given(quantity, payment)
- Analysis: This misorders the arguments for total_cost. total_cost expects (item_cost, quantity), but here it gets (payment, quantity). It also passes (quantity, payment) to change_given, whereas change_given expects (payment, total_cost). This would produce nonsensical results or runtime errors, making this option incorrect.

Option B:
12          result_1 = total_cost(payment, item_cost)
13          result_2 = total_cost(quantity, item_cost)
- Analysis: Here, result_1 calls total_cost with (payment, item_cost) instead of (item_cost, quantity). Even if total_cost could run, the arguments are in the wrong order and do not align with the intended quantities. Moreover, result_2 reuses total_cost with (quantity, item_cost) which does not reflect the required inputs, and it does not compute the change. This option is incorrect due to wrong argument usage and not computing the change.

Option C:
12          result_1 = change_given(payment, item_cost)
13          result_2 = total_cost(quantity, item_cost)
- Analysis: This choice uses change_given for result_1 with (payment, item_cost). While the first argument (payment) is correct in position for change_given, the second argument should be the total_cost, not item_cost. The total_cost should be item_cost * quantity, but this option passes item_cost directly. Then result_2 uses total_cost(quantity, item_cost), which would yield item_cost * quantity only if the parameters were in the correct order, but the total_cost function needs (item_cost, quantity). This option is incorrect due to incorrect parameter ordering and misuse of functions.

Option D:
12          result_1 = total_cost(item_cost, quantity)
13          result_2 = change_given(payment, result_1)
- Analysis: This option uses result_1 = total_cost(item_cost, quantity), which is exactly the intended computation for the total cost. Then result_2 = change_given(payment, result_1) correctly passes the payment as the first argument and the previously computed total_cost (result_1) as the second argument, aligning with change_given(payment, total_cost). This sequence matches the design of main: compute total cost first, then compute change based on payment and the total cost. Hence, this option is consistent with the function signatures and the program flow.

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