In a model economy scenario General Motors produced 1000 cars at $25,000 each in USA in 4th quarter of 2021. 500 cars were sold here in the USA @ $25,000 each. 300 cars were exported @ $25,000 each. Rest of the cars produced in 4th quarter of 2021 remained unsold in 4th quarter of 2021. Calculate the contribution of General Motors in the 4th quarter of 2021 to US GDP accounts. Use both Value Added and Expenditure method. Resolve if there is any discrepancy. (3-4 LINES; SHOW ALL THE STEPS INCLUDING THE FORMULAS)