Compute marginal cost also what is the marginal cost

Question

Compute marginal cost.

 

1.  For the multiproduct cost function C(Q₁,Q₂) = 100 + 2Q₁Q₂ + 4Q₁²,

Illustrate what is the marginal cost function for good one?

a)      MC₁ = 2Q₂ + 4Q₁ - Q₂².

b)      MC₁ = 2Q₂ + 8Q₁.

c)      MC₁ = 100 + 2Q₁Q₂ + 4Q₁².

d)      MC₁ = 4Q₁² - 2 Q₂².

 2.  For the cost function C(Q) = 100 + 2Q + 3Q², the marginal cost of producing 2 units of output is 

1. 2
2. 3
3. 12
4. 14