Let's begin by listing out the given information:
Total annual sale = $515,310
Total accounts receivable = $27,156
The average collection period is obtained as shown below:
[tex]\begin{gathered} AverageCollectionPeriod=\frac{TotalAnnualSale}{TotalAccountsReceivable} \\ AverageCollectionPeriod=\frac{515,310}{27,156}=18.98\approx19 \\ AverageCollectionPeriod=19 \end{gathered}[/tex]