Answer:
b) the amount she paid to buy new parts
Step-by-step explanation:
Gross domestic product (GDP) is the monetary value of goods and services produced in a country within a period of time usually a year.
The second hand car purchased by Sally has already been recognized in the GDP in the period it was first sold. To include the purchase cost again will amount to double counting. Therefore, the expenses that will be included in GDP is the value that has been added, that is, the amount she paid to buy new parts. We do not recognize the value of self service in GDP, therefore the 120 hours she spent refurbishing the car is not to be included.