The cost of $8$ notebooks is $Rs.\ 40$. Find the cost of $12$ notebooks.



Given: The cost of $8$ notebooks is $Rs.\ 40$. 

To do: To find the cost of $12$ notebooks.

Solution:

The cost of $8$ notebooks $=Rs.\ 40$

$\therefore$ Cost of $1$ notebooks $=\frac{40}{8}=Rs.\ 5$

$\therefore$ Cost of $12$ notebooks $=5\times12=Rs.\ 60$ 

Thus, cost of $12$ notebooks is $Rs.\ 60$.

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