A firm is deciding between two different sewing machines. Technology A has fixed costs of $500 and marginal costs of $50 whereas Technology B has...

A firm is deciding between two different sewing machines. Technology A has fixed costs of $500 and marginal costs of $50 whereas Technology B has fixed costs of $250 and marginal costs of $100. ​

If the price is $20 per unit, what is the break even amount of units for technology A?

a.​ 50

b.​ 60

c.​ 70

d.​ None-They would have to shut down