A school prepares a field work in which 350 people will participate (among students, representatives, teachers and professors). The transport company has 8 buses with 32 seats and 10 buses with 54 seats. The rental of a large bus costs Bs. 1,080, and a medium one, Bs. 640. How many buses of each type must be rented so that the cost of the tour is the minimum? How much would the transportation cost for the field work? Please help