Mauro Products distributes a single product, a woven basket whose selling price is $$15$per unit and whose variable expense is $$12$ per unit. The company$$s monthly fixed expense is $$4,200.$

Required:

$1.$ Calculate the company$$s break$-$even point in unit sales.

$2.$ Calculate the company$$s break$-$even point in dollar sales.

$3.$ If the company's fixed expenses increase by $$600,$ what would become the new break$-$even point in unit sales? In dollar sales?