Answer: The accounts receivable turnover ratio is 7.5 times.
Since the question states that "the only transactions affecting accounts receivable were sales of $1,200,000 and cash collections of $1,080,000." , we can infer that the company's credit sales were $1,200,000. We also know that the company collected $1,080,000.
Hence ending accounts receivables will be
[tex]Ending A/R = Beginning A/R + Credit Sales - Cash collected[/tex]
[tex]Ending A/R = 100,000 + 1,200,000 - 1,080,000 = 220,000[/tex]
Next we calculate the average accounts receivable (A/R) as:
[tex]\mathbf{Average A/R = \frac{Beginning A/R + Ending A/R}{2}}[/tex]
Substituting the values we get,
[tex]\mathbf{Average A/R = \frac{100,000 + 220,000}{2} = 160,000}[/tex]
Finally we calculate Accounts receivable turnover as:
[tex]\mathbf{Receivables Turnover = \frac{Net Credit Sales}{Average A/R}}[/tex]
[tex]\mathbf{Receivables Turnover = \frac{1200000}{160000} = 7.5}[/tex]