Question

A box of 15 markers costs $2.40. At the same unit price, how much will a box of 40 markers cost?
$4.80
$6.40
$5.90
$5.15

Answer 1

Answer:

$6.40

Step-by-step explanation:

Answer 2

Before, finding the answer. Let's find out on how we can find the answer.

• To find the cost of 40 markers, we must first find the cost of 1 marker.
• To find that, we must divide the cost of 15 markers with the number of box. Just like this :

$\sf 1 \: marker = \dfrac{Rate}{No \: of \: Box}$

• Then, we must multiply it with the number of boxes.

_____________________

Given :

• No of Markers = 15
• Cost of Markers =  $2.40

To find :

• Cost of 40 markers

Solution :

1 marker $\sf = \dfrac{Rate}{No \: of \: Box}$

               $\sf = \dfrac{2.40}{15}$

               = $ 0.16

Now,

40 markers = Rate of 1 marker × 40

                   = $ 0.16 × 40

                   = $ 6.4

Hence, cost of 40 markers is $6.4 or $6.40.