Question

The cost of 8 identical books is Rs 480,
Tabulate the cost of 35 and 7 books of the
same kind by using unitary method. Do the
number of books and the cost very directly
to each other. If so, calculate the cost of 13
books by using the constant of variation.
​

Answer 1

ANSWER :-

Answer would be 640.

First find cos of 1 book =

6= 480

1= 480 Divide 6.

One book cost 80 rupees

Then cost of 8 books

8*80 = 640.....

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