As of January 1 of the Current Year, the Grackle $$60,000

As of January 1 of the current year, the Grackle Company had accounts receivables of $50,000. The sales for January, February, and March of 2012 were as follows: $120,000, $140,000 and $150,000. 20% of each month's sales are for cash. Of the remaining 80% (the credit sales) , 60% are collected in the month of sale, with remaining 40% collected in the following month. What is the accounts receivable balance as of March 31?

A) $72,000
B) $48,000
C) $58,720
D) $$60,000