A firm has the following balance sheet information: total assets $=$$$100,000$; current assets $=$ $$30,000$; inventories $=$$$10,000$; cash $=$$$5,000$; total liabilities $=$$$30,000$; current liabilities $=$ $$15,000$; and notes payable $=$$$2,000.$ What is the firm's net$-$working$-$capital$-$to$-$total$-$assets ratio?

a$.0\mathrm{.}17$

b$.0\mathrm{.}13$

c$.0\mathrm{.}15$

d$.11$