What is the Supplies account balance at December 31 (Solve for x)? Supplies Available - January 1 5,000 Supplies Purchased during the year 25,000 Total Supplies Available 30,000 Supplies Available - December 31 X Supplies Expense for the year 20,000 a. A debit balance of 50,000 b. A credit balance of 50,000 C. A debit balance of 10,000 d. A credit balance of 10,000