Respuesta :
Based on the information given the optimal combination of factors input is Ksh 168.
Given:
Q = L0.5 K0.4
Let cost minimization of labor and capital=MRTS =MPl/MPk=w/r
Let Marginal product of labor=dQ/dL = 0.2K
Let Marginal product of capital=dQ/dK = 0.2L
Hence:
Marginal rate of technical Â
0.2K/0.2L= K/L
Optimal capital of labor ratio
K/L=3/4
Substitute
Q = L0.5 K0.4
108=K3/4 0.5 K0.4
108=0.15K²
Divide both side by 0.15K²
K²=108/0.15
K²=720
K=√720
K=26.83
Substitute
108= L0.5 (26.83)0.4
108=5.37L
Divide both side by 5.37L
L=108/5.37
L=20.11
TC=wL+rK
TC=3(20.11)+4(26.83)
TC=60.33+107.32
TC=167.65
TC=Ksh168 (Approximately)
Inconclusion  the optimal combination of factors input is Ksh168.
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