Detailed Answer
Correct answer: (B)
Accounts receivable turnover is calculated as: (Net Credit) Sales/Average Net Accounts Receivable.
In this question, it is first necessary to compute average net accounts receivable.
Average Net Accounts Receivable = [Beginning Net Accounts Receivable ($130,000 - $40,000 = $90,000) + Ending Net Accounts Receivable ($100,000 - $20,000 = $80,000)]/2 = ($90,000 + $80,000 = $170,000)/2 = $85,000
Accounts Receivable Turnover = $400,000/$85,000 = 4.705