3. The production manager wants to make efficient use of Capital (K) and Labor (L) inputs to achieve the production target of 972,000 units of product with the production function: Q - 9K L" Where Q - Total production If it is known that the capital interest rate per unit (1) is Rp. 300.00 and the wage of laboy per day (w) is Rp. 75.000,- then a. Determine the marginal product function of capital and labor b. How many units of input K and input L are used to achieve the production target in order to keep costs to a minimum? c. What is the maximum product that should be produced