use the following information to calculate the change in the company's cash balance for the year

credit sales $ 800,000

cash sales $ 500,00

operating expenses on credit $ 200,000

cash operating expenses $ 700,000

accounts receivable( beg. of the year) $ 50,000

accounts receivable (end of the year) $ 80,000

account payable (beg of the year) $50,000

accounts payable (end of the year) $ 100,000

income taxes paid $ 160,000