I have the answers to part A$,$ B$,$ and C$.$

I need the answers to D$-$G$,$ with work shown and and explanation where you got your figures from. I need to actually understand how the answer was received.

Answer to part A: $$191\mathrm{.}25$

Answer to part B: $86,022$ phones $$16,451,708$ in sales to break even

Answer to part C: $$96,250,000$