Jamie Winebottle, an auditor, has decided to use systematic selection of payments when testing the control that payments are supported by a supplier's invoice, a purchase requisition and a goods received note. Each payment comprises a sampling unit. There are 5000 payments made (numbered 1-5000) and the total amount of payments is $10 million. The sample size is 20 and the random start is 127. Given this information, the sample interval is:

Select one:

a.214

b.Some other amount

c.250

d.500 000.