1. A university offers a total of 30 courses each semester. The courses are usually of two types: practical and theoretical. To satisfy the demands of the community, at least 10 courses of each type must be offered each semester. The university estimates that the revenue of offering practical and theoretical courses are approximately $1500 and $1000 per course, respectively. Find the combination of the courses which can maximize the profit. 1. 25 practical and 10 theoretical, profit = $47500 theoretical, profit = $37500 6. 4.0 10 practical and 20 theoretical, profit = $35000 5. 20 practical and 10 theoretical, profit = $40000 12 practical and 18 theoretical, profit = $36000 2. 15 practical and 15 3.O 18 practical and 12 theoretical, profit = $39000