Can someone please explain how to do this algebra word problem?

A shoe store charges a retail price of $39 for a certain type of sneaker. This retail price is 30% more than the amount it costs the shoe store to buy one pair of these sneakers. At an end-of-the-year sale, sales associates can purchase any remaining sneakers at 20% off the shoe store’s cost. How much would it cost an employee to purchase a pair of sneakers of this type during the sale (excluding sales tax)?
A.$31.20
B.$25.00
C.$24.00
D.$21.84
E.$19.50