Capital One Sr. Business Analyst interview questions

The company manufactures 3D Printers. Who should they target selling it to and which one will be more profitable? End customers directly or through retailers? Interviewer asked me to plot graph to show the volume of sales with respect to time for each scenario. Asked to calculate the profit in 2years giving fixed cost 6.6m, over head costs 2.4m/yearly, cost of the item=$250 price of the item sold=$500 and no of units= 2000/monthly. Altered the numbers: when 25% of printers breakdown and cost of repairing each one is 200$. What are the additional printers to be sold to make the profit in 1 year?