Question 61

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.

Solution

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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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