Question

3 73. If the cost of 8 books is 672 then the cost of 9 books is ​

Answer 1

Given,

The cost of $8$ books is $672$

Now to calculate the cost of $9$ books first we have to calculate cost of one book.

The cost of one book $=\frac{672}{8}$

                                   $=84$

The cost of $9$ books will be equal to

                                 $=9(84)\\=756$

Therefore the cost of $9$ books is $756$.

Answer 2

Answer:

$756$

Step-by-step explanation:

Given data,

• The cost of $8$ books $=972$

• Let us find the cost price of one book by using unitary method

• Cost price of one book $=\frac{672}{8}=84$

• Now, the cost price of $9$ books $=84\times9=756$

Hence, the cost price of $9$ books is $756$.