題組內容
4. A cost-minimizing firm has the production function $Q(L, K) = KL + K + L$. Suppose that the price of labor services (L) is 1, and let $r$ denote the price of capital services (K). If the firm aims to produce 20 units of output, for what values of $r$ would the firm use (9%)
(c) \( (3\%) \) both labor and capital?