A company produces toy trains with a fix cost of 2000tl per month. The variable cost is 2tl per train for the first 3000 products produced per month. If the company produces more than 3000 products per month, for all the toys trains after the first 3000, the variable cost increases to 5tl per product. The first 2000 toys are sold for 6 tl. If the demand is higher, if the customer produces more than 2000 toys, company makes a discount and sell each toy for 4tl. a) Calculate the break-even point(s)? b) Show the break-even point(s) on a graph. (Show the profit and loss regions on the graph)