Which item would contribute to the calculation of gross domestic product (GDP)?

The calculation of gross domestic product (GDP) includes the value of all final goods and services produced within a country's borders in a specific time period. Therefore, the sale of windows to a homeowner directly contributes to GDP as it represents a final good produced and sold in the economy. The transaction reflects economic activity and output, which are crucial components in measuring GDP.

In contrast to this, wages paid to employees represent a cost of production rather than a final good or service, so they do not count as GDP on their own. Import costs are subtracted from GDP calculations because they reflect spending that does not contribute to domestic production. Interest on loans, while part of financial transactions, does not directly reflect the production of goods or services and is considered more of a financial cost rather than a contribution to GDP.