Need as much details as possible.
Answer b. TC(Q)= 20Q^3/2
First we find MRTS which is K/L
Then equate this to ratio of factor price i.e w/r= 20/5=4
Put this value in production function
Find K and L in terms of Q.
Finally put all values in TC and solve
TC= w.L+r.K
Complete solution is given in the picture.
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