The cost of a notebook increases in proportion to the number of pages in it. A notebook having 100 pages costs ₹20. Find the cost of a notebook having 400 pages.
Answer & explanation
Correct answer: option 3
The cost of a notebook of 100 pages = 20.
So 100 pages = 20
1 page = \(\frac{20}{100}\)
Cost of a notebook having 400 pages = \(\frac{20}{100}\) × 400 = 80