A)the profit Maximizing quantity of input is ,where, Marginal revenue product of input= price /cost of input
Marginal revenue product=Marginal product of input* price of product
Marginal product of input=4/2*√x=2/√X
Price of good=12
Marginal revenue product=(2/√x)*12=24/√x
Price of input=3
Profit Maximizing condition,
3=24/√x.
√x=24/3=8
X=8^2=64
B) putting profit Maximizing quantity of input into production function,
Q=4*√x=4*√64=4*8=32
C) profit = total revenue- total cost
Total revenue=p* Q=12*32=384
Total cost =price of input* quantity of input=3*64=192
Profit=384-192=192
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