"Herring Corporation has operating income of $$252,000$ and a $40\%$ tax rate. The firm has short$-$term debt of $$220,000,$ long$-$term debt of $$330,000,$ and common equity of $$450,000.$ What is its return on invested capital?"

a$\mathrm{.}16\mathrm{.}8\%$

b$\mathrm{.}15\%$

c$.15\mathrm{.}12\%$

d$.$ None of the above.