4. People assigned to assemble circuit boards for a computer manufacturing company undergo on-the-job training. From past experience, the learning curve for the average employee is given by N(t) = 40(1-e-0.12t) Where N(t) is the number of boards assembled per day after t days of training. a) Graph this function for 0 t 30. b) What is the maximum number of boards and average employee can be expected to produce in 1 day?