help me to solve this problem, thank you.

Liquid reaction A2B is taking place in a steady state packed bed reactor that has total available packing area (A) of 20m2. The density () and packing surface (a) of the catalyst per volume are 0.81g/cm3 and 100cm2/cm3, respectively. The volumetric flow rates in and out are equivalent at molar flowrate (FAo) of 5mol/min, what percentage of the initial feed of chemical A exits the reactor? Hint: the mass of the catalyst in the reactor (W) is related to the packing area (A) by W= A/a. Please express the percentage that exits the reactor to one decimal place