In: Math
A bicycle shop sells two styles of a road bike, 10-speed and 14-speed. During the month of September, the management expects to sell exactly 45 road bikes. The monthly profit is given by P(x,y)=−(1/9)x^2−5y^2−(1/9)xy+10x+65y−100, where x is the number of 10-speed road bikes sold and y is the number of 14-speed road bikes sold. How many of each type should be sold to maximize the profit in September?