A company's balance sheets
December 31
2012 2011
Cash $15,000 $30,000
Receivables 70,000 60,000
Inventories 60,000 50,000
Plant assets (net) 200,000 180,000
345,000 320,000


Accounts payable 50,000 60,000
Mortgage payable (15%) 100,000 100,000
Common Stock, $10 par 140,000 120,000
Retained earnings 55,000 40,000
345,000 320,000

Additional information:
1) Net income was $25,000.
2) Sales on account were $410,000. Sales returns and allowances were $20,000.
3) Cost of goods sold was $198,000.
4) The allowance for doubtful accounts was $2,500 on December 31, 2012, and $2,000 on December 31,2011.

I have tried to divide the current assts/current liabilities,
Adding some of the additional info. To the numbers in numerouse ways. Just not getting it.