Question : The cost of a notebook increases in proportion to the number of pages in it. A notebook having 100 pages costs INR 20. Find the cost of a notebook having 400 pages.
Option 1: INR 60
Option 2: INR 50
Option 3: INR 80
Option 4: INR 40
Correct Answer: INR 80
Solution :
Given: The cost of a notebook increases in proportion to the number of pages in it. A notebook having 100 pages costs INR 20.
Let the cost of a notebook having 400 pages be $x$.
According to the question,
$100:20::400:x$
⇒ $\frac{100}{20}=\frac{400}{x}$
⇒ $x=\frac{20×400}{100}=80$
Hence, the correct answer is INR 80.
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