With your own personal funds, you are looking to delve into the investment world. You want to obtain investments that are fairly safe and diversified but require little effort on your part to maintain those qualities. You decide to invest in a mutual fund. Compute the NAV of the investment fund that owns $$4,000,000$ in stock and has $$3,500,000$ in debt, $$150,000$ in cash, $$215,000$ in liabilities, and a total number of shares outstanding of $1,200,000.$

a$.$ $$3\mathrm{.}15$

b$.$ $$6\mathrm{.}55$

c$.$ $$6\mathrm{.}07$

d$.$ $$6\mathrm{.}20$