Deluxe River Cruises operates a fleet of river vessels. The fleet has two types of vessels: A type-A vessel has 55 deluxe cabins and 155 standard cabins, whereas a type-B vessel has 75 deluxe cabins and 130 standard cabins. Under a charter agreement with Odyssey Travel Agency, Deluxe River Cruises is to provide Odyssey with a minimum of 430 deluxe and 805 standard cabins for their 15-day cruise in May. It costs $44,000 to operate a type-A vessel and $54,000 to operate a type-B vessel for that period. How many of each type of vessel should be used in order to keep the operating costs to a minimum?