12. Two products Y and Z are obtained in a crude form and require further processing at a cost of ` 6 for Y and ` 5 for Z per litre before the products can be sold in the market. The final prices of product Y and Z are ` 15 and ` 8.75 per litre respectively. The company earns a net margin of 25% on Cost. The following data is available for output of both the products for the year Y 8,000 Litres Z 6,000 Litres A joint cost of ` 60,000 was incurred for the year and company apportions the joint costs on the basis of net realisable value after further processing. Calculate the joint cost per unit of product Y.

The value of $\displaystyle N$ in $\displaystyle N! + \frac{1}{7!} = \frac{1}{8!}$ is

A person can go from place 'A' to 'B' by 11 different modes of transport but is allowed to return to 'A' by any mode other than the one earlier. The number of different ways in which the entire journey can be completed is:

If a man travels from place A to B in 10 ways then by how many ways can he come back by another train?

If $\displaystyle \frac{n!}{10(n-1)!} = \frac{(n-1)!}{(n-3)!}$ find 'n'.

Which of the following is a correct statement.

$\displaystyle ^nP_3 = 2 \cdot ^nP_2$. Find $\displaystyle n$.