Please show all steps and explanation. I will give a like if you do. Thank you!

Problem 4 A stirred tank receives a sugar solution 20% by weight at a flow rate of 40 kg/min, and it is drained at a flow rate pf 40 kg/min. Initially the tank contains 120 kg of a solution that contains 30% by weight sugar. a) Make a graph of the the mass fraction in the tank as a function of time. Your graph must be done onthe computer and must be proeprly annotated. b) What is the mass fraction of sygar in the tank after 5 min? c) What is the mass fraction in the tank after very long time