Question

bookworm.com sells its audio books at the same rate and are currently advertising 3 audio books for $39.60. how much would seven audio books cost?

Explanation:

Step1: Find the cost per audio book

To find the cost of one audio book, we divide the total cost for 3 audio books by 3. The total cost for 3 audio books is $39.60, so the cost per audio book is $\frac{39.60}{3}$.
$\frac{39.60}{3} = 13.20$

Step2: Calculate the cost for 7 audio books

Now that we know the cost per audio book is $13.20, we multiply this by 7 to find the cost for 7 audio books. So the cost for 7 audio books is $13.20\times7$.
$13.20\times7 = 92.40$

Answer:

92.40