PROBLEM 2 Given that a field cultivator having a unit price function of $400 per ha per h, a 16% ownership cost percentage, is to be used on 200-ha twice each year with labour and tractor ownership costs of $3/ha each in order to produce a crop valued at $150/ha (i.e. its YV- value). There are 10 field working hours per day at a probability of 0.8; and the operations will be balanced at 2 = 4. The value of Kz is selected as 0.0002. If the field speed is expected to be 8km/h and the field efficiency is 0.80, a) Determine the required width of the field cultivator for the farm operation. [5 marks] b) State five reasons for which a machine may need to be replaced. [5marks] PROBLEM 2 Given that a field cultivator having a unit price function of $400 per ha per h, a 16% ownership cost percentage, is to be used on 200-ha twice each year with labour and tractor ownership costs of $3/ha each in order to produce a crop valued at $150/ha (i.e. its YV- value). There are 10 field working hours per day at a probability of 0.8; and the operations will be balanced at 2 = 4. The value of Kz is selected as 0.0002. If the field speed is expected to be 8km/h and the field efficiency is 0.80, a) Determine the required width of the field cultivator for the farm operation. [5 marks] b) State five reasons for which a machine may need to be replaced. [5marks]