mba, inc. is preparing its financial statements for the year ended december 31, 20x1. accounts payable amounted to $300,000 before any necessary year-end adjustment related to the following: at december 31, 20x1, mba has a $30,000 debit balance in its accounts payable to kay co., a supplier, resulting from a $30,000 advance payment for goods to be manufactured to mba's specifications. checks in the amount of $80,000 were written to vendors and recorded on december 29, 20x1. the checks were not mailed until january 3, 20x2. what amount should mba report as accounts payable in its december 31, 20x2, balance sheet?