29. The following information is extracted from the financial statements of Osila Fashion House, Revenue for the period 1,200,000 Receivables at the start of the period 615,000 Receivables at the end of the period 512,000 Cost of materials sold in the period 540,000 Inventory of materials at the end of the period 155,000 Inventory of materials at the start of the period 140,000 Payables at the start of the period 114,000 Payables at the end of the period 111,000 Which of the following represents the purchases of materials for the period? a 525,000 b. 680,000 c. 555,000 d. $475,000