Acme Company is considering the addition of a new product line. Management expects annual sales of the new product to be $4,000$ units at a price of $$920$ per unit. Variable operating costs are $$522$ per unit and the new product line will increase Acme's total fixed operating costs by $$600,000.$ If Acme adds the new product line, the contribution margin on its existing products is expected to drop $$156,000$ per year. What is the minimum per$-$unit selling price that Acme must charge to break even on the production and sale of the new product line?

$$ $$691$ per unit

$$711$ per unit

$$672$ per unit

$$621$ per unit

$$ None of the above