Determine the two largest transaction amounts for each of the four types of transactions. For transaction types with negative balances use absolute values. Identify any that are significant enough to warrant further testing by examining supporting documentation. Do a separate stratification of sales and credit memo transactions using minimums, maximums, and number of strata that you consider useful and determine if there are any transactions that should be examined for supporting documentation. Briefly describe what you did, including the stratification criteria and what you found. The in-charge asks you to filter the transaction file so that it contains only sales (invoice) transactions. She then requests that you determine the sample size to test the sales (invoice) transactions using a confidence level of 90%, an upper error limit of 10%, and no expected errors. Calculate the required sample size.