QUESTION 6 You are using dollar unit sampling in the audit of sales. Total sales revenue recognised in the trial balance was $2,000,000 The sample size is 100 You use systematic sampling with a random start. You use a random number generator to yield the starting point. That number is 14,450. You prepare the following table showing the cumulative total of invoices Invoice No. Amount ($) 20100001 5,000 20100002 8,000 20100003 13,000 20100004 10,000 20100005 18,000 20100006 10,000 20100007 12,000 Cumulative Total ($) 5,000 13,000 26,000 36,000 54,000 64,000 76,000 Required: (a) What is the value of the sampling interval? (b) What are the invoice numbers for the first and third items selected