Experiments show that the quantities x of corn and y of soybean required to produce a hog of weight Q satisfy Q = 0.5x^1/2y^1/4. The unit of x, y, and Q is the cwt, an agricultural unit equal to 100 lb. Find the values of x and y that minimize the cost of a hog of weight Q = 2.5 cwt if corn costs $3/cwt and soy costs $7/cwt.