Question

The shampoo you like to use is on sale. But you only get the lower price if you buy 3 bottles...?
...You want to know how much you'll save
What is the formula?
s=sales price per bottle
r=regular price per bottle
c=cost savings

Answer 1

c=3r-3s

3, since you buy 3 bottles. c is the total cost savings.

Answer 2

it will be c= 3(r-s)

Answer 3

The best way to go about this is to make up a scenario:

Suppose shampoo costs $5 per bottle, which would amount to $15 if you purchased thee bottles. However, you can buy 3 bottles for $12

To find the sales price, you would divide $12/3 = $4. So you're basically saving $3

so in essence
r = $5
s = $4
c = $3 ($1 per bottle)

As for a formula:

It will in general be

Regular Price - Sales Price = Cost Savings...so

r - s = c

In this case $5 - $4 = $1 meaning you'll save $1 per bottle.

Answer 4

nah. but you need to buy 3 bottles remember? @hero

Answer 5

apoorvk, are you sure you read everything I posted? If you're saving $1 per bottle, and you buy three bottles, $1 times 3 = a total cost savings of $3. I already addressed buying 3 bottles. If you have a better explanation, you should provide one rather than trying to negate mine.

Answer 6

Okay fine...

For three bottles:

3(r - s) = 3c

Answer 7

ohkay. i somehow missed the last line. sorry, my bad!

Answer 8

but, 'c' is the total savings already, and not the savings per bottle, so i guess just "c=3(r-s)" shall do.

Answer 9

@apoorvk , you speak too fast

r = $5
s = $4
c = $1

3(r - s) = 3c

3(5 - 4) = 3
15 - 12 = 3
3 = 3

Answer 10

c = $1 in this case

I originally posted c = $3

The correct equation stands at 3(r - s) = 3c

Answer 11

umm. right, i did speak too fast there. dumb me. apologies once again. silly me!