1) A plant operation for 1 year has fixed costs Cr, variable costs NV, regulated costs NR, and sales realization NS, as follows, where N is the operating rate in present; Cr= 20,000, NV = 500N, NR = 15,000+30 N^ 1.5 & NS = 2000N-3.5N^2. a) Find Break Even Points (BEP) b) Maximum Profit Point and Maximum Profit c) Maximum sales realization point and maximum total return. d) Caleulate maximum unit profit. e) Caleulate minimum average unit cost