A farmer is planting two types of crops, corn and soybeans. Each acre of corn requires $1.2$ hours of labor to plant and yields $120$ bushels. Each acre of soybeans requires $0.8$ hours of labor to plant and yields $90$ bushels. The farmer has a total of $30$ hours of labor available for planting and wants to plant $c$ acres of corn and $s$ acres of soybeans. If the farmer plants $15$ acres of corn, what is the maximum total number of bushels of corn and soybeans the farmer can yield?