Copy ofwhat value is assigned to cost?def calculate_total(price, tax=0.1): total = price + (price * tax) cost = calculate_total(20)未知题型
A
22
B
a run-time error
C
20
D
None

Question

Copy ofwhat value is assigned to cost?def calculate_total(price, tax=0.1): total = price + (price * tax) cost = calculate_total(20)

BlackTom AI · Accepted Answer

We start by understanding what the code is doing step by step.
Option 1: 22. This would be the result if the function calculate_total returned the computed total price (price + price*tax). However, inside the function, although total is computed, there is no return statement to send that value back to the caller. So the function does not produce 22.
Option 2: a run-time error. The code as written does not have a syntax error or a runtime error on calling calculate_total(20). It simply executes and returns None because there is no return value specified. Therefore this option is incorrect.
Option 3: 20. This would imply that the cost variable ends up equal to the original price without applying any tax or function result. Since the function call is performed, the value assigned is whatever the function returns (which is None), not the original price. So 20 is not what cost becomes.
Option 4: None. The function calculate_total does not return anything (no return statement), so the expression cost = calculate_total(20) assigns the return value of the function, which is None, to cost. This matches how Python functions behave when no return is specified.
Overall, the key idea is that the function computes a value but never returns it, so the caller receives None rather than a numeric total or the original price.

Copy ofwhat value is assigned to cost?def calculate_total(price, tax=0.1): total = price + (price * tax) cost = calculate_total(20)未知题型

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