Knoxville Manufacturing Company produces X and Y with contribution margins per unit of $10 and $90, respectively. Only 200 labor hours and 400 machine hours are available for production Time requirements to produce one unit of X and Y are as follows: Product X Product Y Labor hours per unit Machine hours per unit What is the constraint on machine hours for Knoxville Manufacturing Company? 10X +90Y 200 1X + 2Y = 400 5x+18