Springer Sports Company manufactures ultra$-$lite badminton rackets. The rackets are sold exclusively online. Each racket sells for $$20($$$16$ plus $$4$ shipping and handling.$)$ Springer$$s contribution margin ratio is $60\%.$ Springer calculates breakeven units to be $4,000$ per month.

a$.$ What is the unit variable cost of a badminton racket?

b$.$ What is Springer$$s monthly fixed cost?

c$.$ Suppose Springer introduces an offer for $$free$$ shipping and handling. How many

additional rods will Springer have to sell each month to break even?