# cost minimization knowing the cost of labor and capital

The production function is $f(L,M)=4L^{0.5}M^{0.5}$ , where L is the number of units of labor and M is the number of machines used . If the cost of labor is \$100 per unit and the cost of machines is \$16 per unit, then the total cost of producing 7 units of output will be: