Suppose you own a store after your graduation and specialize in selling air$-$conditioners. You buy air$-$conditioners for $$180$ per piece. Your rent, utilities, transportation, taxes, etc. add up to $$8,800$ per month.

Suppose your selling price per unit is $$260.$ What should be your monthly sales $($in quantity and dollar amount$)$ in order to break$-$even? Plot total cost and revenue on a graph paper and show the break$-$even point on both axes and write the quantity and dollar amount.

How much profit or loss will occur if your monthly sales were only $100$ units at a selling price of $$260$ per unit?