3. A tank contains 100 gal of water and 50 oz of salt. Water containing a salt concentration of 1+ sint oz/gal flows into 4 2 the tank at a rate of 2 gal/min, and the mixture in the tank flows out at the same rate. a. Find the amount of salt in the tank at any time. Gb. Plot the solution for a time period long enough so that you see the ultimate behavior of the graph. c. The long-time behavior of the solution is an oscillation about a certain constant level. What is this level? What is the amplitude of the oscillation?