what is the equation used to come up with the answer?

You know the following information about the Webb State Bank: Accumulated depreciation Net loans Fed Funds purchased and repurchase agreements Cash and due from banks Trading account securities Miscellaneous assets Deposits Undivided profits Gross premises Surplus Subordinated debt Investment securities Common stock par Gross loans $40 600 200 50 40 100 500 140 90 40 100 160 20 700 Given this information, what is the value of this firm's total equity? $1,000 $300 $800 D. $200 $500