$9-21$ Edwards has decided to use monetary$-$unit sampling in the audit of an entity's accounts receivable balance. Few, if any, misstatements of account balance overstatement are expected.

Required:

a$.$ Identify the advantages of using monetary$-$unit sampling over classical variables sampling.

b$.$ Calculate the sample size and the sampling interval Edwards should use for the following information:

Tolerable misstateryent

$$15,000$

Expected misstatement

$$6,000$

Desired confidence level

$95\%$

Recorded amount of accounts receivable

$$300,000$

c$.$ Calculate the UML assuming that the following three misstatements were discovered in testing based on the MUS sample computed in part $b.$

$\backslash$table$[[$Misstatement Number,Book Value,Audit Value$],[1,$$$400,320],[2,500,0],[3,3,000,2,500]]$