Data collected at a parking lot indicate that a total of 425 cars park between 8:00 a.m. and 5:00 p.m. Twenty percent of these cars are parked for an average of 2 hr, 20% for an average of 3 hr, 25% for an average of 4 hr, and the remaining cars are parked for an average of 9 hr. If 10% of the parking bays are vacant on average (between 8:00 a.m. and 5:00 p.m.) at the parking lot, determine the number of parking bays in the parking lot. Assume an efficiency factor of 0.90. (Round your answer to the nearest integer.) parking bays