Question: Suppose that 40% of patients respond to treatment A. The average cost with A for the patients who respond is € 2,000 per patient. The average cost with A for patients who do not respond is € 5,000. What is the expected cost of treatment A for a patient ?: 
 Options:  <1> € 2,000 <2> € 3200 <3> € 3500 <4> € 3,800. <5> € 5,000
4