A store has an average arrival rate of 30 per hour. The management are seeking to assess whether there should be a two-service point system each being capable of dealing with 18 per hour or a three-service point system each dealing with up to 14 per hour. the two-point system cost £80 per hour total and the three-point system, £100 per hour in total. Customers waiting time is assessed at £6 per hour. Calculate P_0 for the two and three service point systems