Break$-$Even Point and Target Profit Measured in Sales Dollars $($Single Product$).$ Mammoth Company has monthly fixed costs totaling $$200,000$ and variable costs of $$40$ per unit. Each unit of product is sold for $$50($these data are the same as the previous exercise$)$:

Required:

a$.$ Calculate the contribution margin ratio.

b$.$ Find the break$-$even point in sales dollars.

c$.$ What amount of sales dollars is required to earn a monthly profit of $$120,000?$