can you explain why non-operating is 500 not 400 and marketable securities is 400 not 300? Thanks!

Based on the following data, what is the NPV of operations? Balance sheet items: Marketable securities =300 Non-operating long-term assets =400 Cash =100 Accounts receivable =600 Inventory =1000 Operating long-term assets (net of depreciation) =14,000 Accounts payable =1,100 Accrued taxes =200 Short-term debt =100 Long-term debt =5,000 (1,000 par value, 5 bonds) Equity =10,000 ( 10 book value per share, 1,000 shares) Market values: Market value of the marketable securities =400 Market value of non-operating long-term assets =500 Market value of short-term debt: 100 Long-term bonds: market value per bond: 1,000 IVIaI Ket vaiues. Market value of the marketable securities =400 Market value of non-operating long-term assets =500 Market value of short-term debt: 100 Long-term bonds: market value per bond: 1,000 Common stock: Market price per share: 13.00 Select one: a. $2,900 b. $2,950 c. $2,850 d. $2,800