Suppose that a firm currently employs 900 units of capital and 540 units of labor, and has a marginal product of labor of MP_L= 10 and a marginal product of capital of MP_K= 8. If the wage rate is w = $24 and the user cost of capital is r = $15, clearly explain how the firm could produce more output without increasing its costs.

[Note: I'm only looking for a qualitative answer here; the information provided is not sufficient to calculate the optimal combination of capital and labor, only to indicate the direction in which the firm should adjust its input mix.]