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Unitary Method

Find the cost...

Question

Find the cost of $3$ books if the cost of $8$ books is $480 R s .$

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Solution

Cost of $8$ books is $480 R s .$
Cost of one book is $\frac{480}{8} = 60 R s .$
The cost of $3$ books is $3 \times 60 = 180 R s .$

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