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To solve part (a) of this problem, we need to find the profit-maximizing combination of labor (\( L \)) and capital (\( K \)) for producing 147 watches. Given the production function and costs:

1. **Production Function**: \( f(L, K) = 3L^5 K^3 \)
2. **Output**: Karolex wants to produce 147 watches, so \( f(L, K) = 147 \).
3. **Cost of Labor and Capital**:
   - Each unit of labor costs \( w = 6 \)
   - Each unit of capital costs \( r = 5 \)

### Steps to Solve

1. **Set up the production constraint**: \( 3L^5 K^3 = 147 \).
2. **Cost function**: Total cost \( C = wL + rK = 6L + 5K \).
3. **Using the Lagrange Multiplier Method**:
   - We define the Lagrangian function: 
     \[
     \mathcal{L}(L, K, \lambda) = 6L + 5K + \lambda (147 - 3L^5 K^3)
     \]
   - Take the partial derivatives with respect to \( L \), \( K \), and \( \lambda \) and set them equal to zero.

4. **Solving the system of equations** will give the optimal values of \( L \) and \( K \) that minimize cost for the target output of 147 watches.

Would you like a step-by-step calculation for solving the system of equations, or is there a specific part you'd like to delve into? 

### Relative Questions:
1. How does the cost of labor and capital affect the optimal production inputs?
2. What role does the production function's form play in determining input levels?
3. How would changing the target production output affect the optimal combination of \( L \) and \( K \)?
4. What would happen if the cost of either labor or capital changed?
5. How would Karolex adjust production if there were constraints on labor availability?

**Tip**: The Lagrange multiplier method is a powerful tool for finding optimal input combinations under constraints in economics.

What is the profit maximizing combination of capital and labor Karolex will use to produce the 147 watches? (Both inputs are variable.)

Learn how to find the profit-maximizing combination of labor and capital for Karolex's watch production using optimization techniques. This exercise involves a production function with inputs labor and capital, a cost function, and the Lagrange Multiplier Method for constrained optimization. Suitable for undergraduate economics or mathematics students.

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