Graph the system of Inequalities:

3x-2y12

x+2y12

x0

y0

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A store sells two types of toys, A and B. The store owner pays $5 and $2 for each one unit of toy A and B respectively. One unit of toys A yields a profit of $10 while a unit of toys B yields a profit of $12. The store owner estimates that no more than 2500 toys will be sold every month and he does not plan to invest more than $8,000 in inventory of these toys. How many units of each type of toys should be stocked in order to maximize his monthly total profit?