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.
A notebook having 100 pages costs ₹20.
So 100 pages = ₹20
1 page = ₹$$\frac{20}{100}$$
Cost of a notebook having 400 pages = ₹$$\frac{20}{100}\times400$$
= ₹80
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