Biltrite audit case study | Accounting homework help

I need hellp with the attached case study. The book from which the case originates is

 

Auditing: A Risk-Based Approach to Conducting a Quality Audit, Ninth Edition, Johnstone/Gramling/Rittenberg. There are excel files that go along with this case found on the text website under student resources. I need answer to the requirements in the case. Please use atleast three peer review sources and observe APA style of writing.