$3.$ Using the overall average revenue per vehicle for $2018$ that you computed in Question $1,$ calculate the average selling price for the Model $3$ in $2018,$ taking the average selling prices for Model S and Model X of $$110,000$ and $$130,000,$ respectively, as given. Round your answer to the nearest penny. For $2$ bonus points, use Excel$$s Solver feature to solve for the average price of the Model $3$ that satisfies the system of equations and related constraints. As evidence of your use of Solver, please specify the objective function, values to change, and constraints imposed.

$4.$ Using your answer from Question $3$ and the average of the selling prices for Model S and Model X $($pre$-$populated in template$),$ calculate a new average selling price per vehicle as the weighted average by model. Then, calculate a new expected revenue for $2019$ using this resulting average. This approach disaggregates revenue by model, which should yield a more precise expectation for total revenue. Based on the results of this revised approach, does Tesla$$s total automotive revenues appear complete and accurate in all material respects as of and for the year ended December $31,2019?$ Explain why or why not.