At the start of the period, a business has total assets of ₱500,000 and total liabilities of ₱300,000. During the period, the business earned total income of ₱1,000,000 and total expenses of ₱640,000. No additional investments or withdrawals were made by the owner. Total assets at the end of the period were ₱830,000. How much is the total liabilities at the end of the period? A. 280,000 B. 270,000. C. 260,000 D. 240,000