Samru Has Been Assigned the Sales Cycle as Part of an Audit

Essay

Samru has been assigned the sales cycle as part of an audit team.He will be evaluating several key controls in the sales cycle and conducting tests of detail for accounts receivable.Samru has been told to look at 15 customers with respect to the credit limit approval process (a test of control).Then,he has been told to use dual purpose tests for the rest of his testing.
Required:
Explain the relationship between tests of controls,dual purpose tests,and tests of details.