A taxi driver provides service in two zones of a city. Fares picked up in zone A will have destinations in mnc A with probability .6 or in zone B with probability .4. Fares picked up in zone B will have destinations in zone A with probability .3 or in zone B Wih probability .7. The driver's expected profit for a trip entirely in zone A is 6; for a trip entirely in zone B is 8; and for a trip that involves both zones is 12. Fuld the taxi driver's average profit per trip.