Aisha applies a mark-up of 25% to obtain the selling price of her goods. She provided the following information:
                                                                 $
Opening inventory ..................      4,800
Closing inventory ......................     6,200
Revenue ..................................      70,000

How much were Aisha’s purchases for the year?

A. $51,100

B. $53,900

C. $54,600

D. $57,400