The cost of a firm has increased from Rs. $67$ to Rs. $80$ when the units of cotton production rose from $8$ to $9$. Calculate the marginal cost of a firm?

Match List-I with List-II

Choose the correct answer from the options given below:

At the positive level of output, where a firm's profit is maximized, the following conditions must hold.

(A) $p = LRMC$

(B) LRMC is non-decreasing at $q_0$

(C) $p \leq LRAC$

(D) $p \geq$ min. LRAC

Choose the correct answer from the options given below:

A firm increased the capital by a unit, which led to a rise in total product from 10 units to 24 units. Further increase in capital in the same quantity leads to an increase in total product to 40 units. What is the difference in change in marginal product?

1. 14
2. 2
3. 30
4. 16

For a hypothetical firm, the total cost of producing 5 units of a commodity is Rs. 310 and that of producing 8 units is Rs. 850. If the firm has to spend Rs. 50 even when there is no output, what will be the marginal cost of producing the 8th unit?

Consider a production function $q = f (x_1, x_2)$ where the firm produces q amount of output using $x_1$ amount of factor 1 and $x_2$ amount of factor 2. Now suppose the firm decides to increase the employment level of both the factors t (t > 1) times.

Identify the correct statement from the following.

From the following which is incorrect with respect to firm's profit maximization in long run?

1. Price = Long Run Marginal Cost
2. LRMC is first decreasing and then increasing
3. Price = Short Run Marginal Cost
4. Price ≥ Long Run Average Variable Cost