The following are the ratios relating to the activities of National Traders Ltd: Gross profit for the current year ended December 31 amounts to `4,00,000. Closing stock of the year is `10,000 above...

The following are the ratios relating to the activities of National Traders Ltd:

Gross profit for the current year ended December 31 amounts to `4,00,000. Closing stock of the year is `10,000 above the opening stock. Bills receivable amount to `25,000 and bills payable to `10,000. Find out: (a) Sales, (b) Sundry debtors, (c) Closing stock, and (d) Sundry creditors.