Question

A grocery store sells 6 bottles of water for $4.80 and 18 bottles of water for $22.50. Is the cost proportional to the number sold? Explain

Answer 1

No, because both operation don't have a Constant of Proportionality related.

Explanation:

We can see this calculating the Constant of Proportionality in both cases:

`(4.80)/(6) = 0.80\\\\\\(22.50)/(18) = 1,25`

We can see that, the proportion is not a Constant, which means that costs are not proportional between the number of bottles sold.

Answer 2

No the cost is not proportional to the number sold.

6 bottles divided by $4.80 = .80 each
18 bottles divided by $22.50 = $1.25 each