Perez Company's Net Accounts Receivable Were $600,000 at December 31

Perez Company's net accounts receivable were $600,000 at December 31, 2010 and $660,000 at December 31, 2011.Net cash sales for 2011 were $390,000.The receivables turnover for 2011 was 7.0.What were Perez's total net sales for 2011?

A) $2,730,000.
B) $4,410,000.
C) $4,800,000.
D) $4,020,000.