PLease help me how to get the above answer 920,000?

Thanks

35. Mopoke Ltd provides the following information that relates to the period ended 30 June 2014: Sales for the year Discounts provided to customers for early payment Doubtful debts expense Opening balance of accounts receivable Closing balance of accounts receivable Bad debts expense Opening balance of the provision for doubtful debts Closing balance of the provision for doubtful debts $000 1 200 5001 150 300 900 20 20 10 What amount of cash was received from customers during the year? A. $1 780 000 B. $930 000 C. $1 720 000 D. $920 000