Jenny's utility is given as U(x,y)=min{2x,4y}. Let Px and Py prices of x and y, respectively, and m denotes her income. Then,
a)Find the ordinary demand functions for x and y.
b)Assuming that Px=Py=$1, show that the sum of the ordinary demands of x and y (x^*+Y^*) is equal to Jenny's income(M).