Granite Company uses the cash basis of accounting to record transactions. Granite made $60,000 in payments to its suppliers for operating costs during the year. Granite's beginning prepaid expenses were $40.000, and its ending prepaid expenses were $30,000. In addition, Granite had beginning accrued expenses of $50,000 and ending accrued expenses of $70,000. What are Granite's operating expenses converted to the accrual basis of accounting? a. $50,000 b. $60,000 c. $90,000 d. $70,000