$1.$ How does shifting the sales mix at Ford Motor Company to more F$-150$ trucks affect Ford$$s break even sales volume? Ford Motor Company $($FORD$)$ sales jumped $31\mathrm{.}5\%$ during June $2022$ in the United States as compared to the prior month. Sales of Ford$$s F$-$series trucks and the Explorer, Expedition, and Navigator SUV models drove the sales growth. According to a Bloomberg article $($link$)$ earlier this year, the F$-150$ Series product line is Ford$$s most profitable product line. Ford has three categories of vehicles, Trucks, SUVs, and Cars. According to Ford$$s $2021$ Form $10-$K$,$ below are the combined US unit sales of its vehicles in $2021($both retail and wholesale$).$ In addition, hypothetical average sales prices and average variable cost per unit are given.