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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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