James Patel is auditing the accounts receivable of Carter Ltd for the year ended 30th June 2019. Carters accounts receivable balance was recorded at $4,000,000 and comprised more than 3,000 customer accounts. However Carters 20 largest customer balances comprised a high percentage of the recoded accounts receivable (more than $2,500,000 or 25%). As a result, James is considering using Dollar Unit Sampling. Based on prior audits and other judgments, James has established the following parameters: Risk of Incorrect Acceptance 10% Tolerable Error $350,000 Expected Error $250,000 Required: a. Determine the required sample size that would be used by James in the audit of Carter Ltd. Show all workings/logic/approach marks will be awarded for your workings/logic/approach. b. Calculate the sampling interval show all workings. c. In your own words explain the concept of tolerable error in sampling this must be written in your own words.