Question

four copies of a book cost Rs 130. 40 rupees find the cost of 12 copies of the same book​

Answer 1

Answer:

The cost of 12 copies of books is Rs 391.2

Step-by-step explanation:

Given as :

The cost of 4 copies of books = Rs 130.40

Let The cost of 12 copies of books = Rs x

Applying unitary method

∵ The cost of 4 copies of books = Rs 130.40

So, The cost of 1 copies of book = Rs $\dfrac{130.40}{4}$

∴ The cost of 12 copies of books = Rs $\dfrac{130.40}{4}$ × 12

Or, x = rs 130.40 × 3

i.e  x = Rs 391.2

So,The cost of 12 copies of books = x = Rs 391.2

Hence, The cost of 12 copies of books is RS 391.2  Answer