A survey of engineering firms reveals that 80% have their own mainframe computer (M), 10% anticipate purchasing a mainframe computer in the near future (B), and 5% have a mainframe computer and anticipates buying another in the near future future. Find the probabilityr that a randomly selected firm: (a) has a mainframe computer or anticipates purchasing one in the near future (b) does not have a mainframe computer and does not anticipate purchasing one in the near future(c) anticipates purchasing a mainframe computer given that it does not currently have one(d) has a mainframe computer given that it anticipates purchasing one in the near