Atank contains 1240 L of pure water. A solution that contains 0.09 kg of sugar por ter enters a tank at the rate 5 min The solution is mixed tind drains from the tank at the same rate. (a) How much sugar is in the tank initially (b) Find the amount of sugar in the tank after minutes amount -(kg) [your answer should be a function of t) () Find the concentration of sugar in the solution in the tank after 75 minutes concentration (kg/)