Provide an explanation for how the following situations are accounted for in the expenditure approach to determining GDP.

Situation 1: A new truck is produced in Canada and sold to a Canadian business that uses the truck to make deliveries.

Situation 2: A new computer is imported from China and sold to a consumer in Canada at a store downtown

Situation 3: A person fixes their own car using supplies that they have owned for years.

please be detailed, thank you so much!