In a gas absorption unit, a $300$ mol$/$min feed gas containing SO$2$ and species A is contacted with fresh water stream that absorbs SO$2.$ The gas stream exit from the top of the absorption unit with total flow rate $200$ mol$/$min and $5$ mol$\%$ SO$2$ in the exit gas stream. It is given that the liquid stream exit from the bottom of the absorption of A and evaporator of water in the absorption unit can be neglected. Calculate the flow rate of SO$2$ absorbed by the liquid stream.