Use FLEXSIM to build simulation models. as described below If the daily demands of products A, B and C are 1200-1500, 1000-1300 and 700-1000, respectively, considering the following information, how many products of each type should be produced to make maximal profits.

1. The processing time of product A on machines 1, 3 and 4 are U(25,35), U(100,120) and U(30,35). The processing time of product B on machines 2, 3 and 4 are U(20,30), U(100,130) and U(20,35). The processing time of product C on machines 1, 2, 3 and 4 are U(30,45), U(25,40), U(120,150) and U(30,35). The inter-arrival times of products A, B and C are U(25,35), U(30,40) and U(40,45). There is a setup time of U(10,20) before the first product of the same type is processed.Besides, the setup task needs an operator to perform. The walking speed of an operator is 0.5m/s.
2. Products arrive in batches. Also, the number of each batch is between 20~30. The types of products have to be different in consecutive batches.
3. Machine 3 processes products in batches. The number of each batch is 30.
4. Except for machine 3, the others process products one by one.
5. The distance between machine 3 and machine 4 is about 20 meters. Products have to be transported by a forklift or a conveyor. The speed of a forklift is 1m/s and that of conveyor is 1m/s as well. However, a forklift needs an operator to transport products in batches of 10 and the loading/unloading is 10s/5s. There is no loading/unloading for a conveyor.

The prices of related items are as follows.

Item	Price
Product A	$10
Product B	$12
Product C	$20
Machine 1	$100,000
Machine 2	$150,000
Machine 3	$500,000
Machine 4	$120,000
Forklift	$50,000
Conveyor	$150,000
Operator	$1,000/day/per person

1. How many days does your model approximately reach the break-even point?
2. Describe advantages and disadvantages of your model.
3. If only one operator is hired, what does your model look like?