3. A carwash employs workers on daily price-rate basis for their weekly work. There are five worker and their charges and speed are different (Table 1). According to an earlier understanding only one job is given to one worker and the worker is paid for a full hour even if he works for a fraction of an hour. There are five rent a car firms which each worker should wash the cars of one these firms. The number of received car from each of the mentioned firms is in Table 2. Table 1 Table2 Worker Rate per day $ No of cars washed/day Firms No of received cars A 50 12 1 50 BCDE 60 14 2 85 30 8 3 70 40 10 4 124 40 11 5 84