Calculate the average density of an interply hybrid beam containing m layers of IM7 carbon fiber- epoxy and n layers of E-glass fiber-epoxy. The thickness of each carbon fiber layer is tc and that of each glass layer is tg. The fiber volume fractions in carbon and glass layer layers are vc and vg, respectively. Hint: To get volume fraction of the matrix in the beam you must use a ratio of plies which take into account the thickness differences in material.