A Firm Collects 10% of Its Sales in the Month

A firm collects 10% of its sales in the month of sale, 60% in the following month, and 30% in the second month following the sale. Sales for the firm by month are: What is the accounts receivable balance at the end of June?

A) $17,100
B) $18,400
C) $23,900
D) $26,000
E) $31,400