Posted by Rosedala on Monday, April 12, 2010 at 3:58pm.
Whichh is cheaper of the 2 following boxes?:
One liter (1000 ml) per bottle, 12 in a box: $60 per box
OR:
Three quarter (750 ml) liter per bottle, 12 in a box: $40 per box
thank you so very much!

Arithmetic  Ms. Sue, Monday, April 12, 2010 at 4:24pm
1,000 ml * 12 = ?
Divide 60 by the above number to get the cost per ml.
750 ml * 12 = ?
Divide 40 by the above number to get the cost per ml.

Arithmetic  Rosedala, Monday, April 12, 2010 at 4:58pm
I'm sorry Ms. Sue, but I'm an arithmeticchallenged adult and my face is quite red:
I divided 60 by 1000 and got 0.06
Did the same with 40 and got 0.0533
How do I know which is cheaper since the 2nd one has less content (only 3/4 of liter as opposed to one full liter?
Please forgive my taking your time again, and thanks so very much! :o)

Arithmetic  Ms. Sue, Monday, April 12, 2010 at 5:05pm
1000 * 12 is not 1000
1000 * 12 = 12,000
60/12,000 = $0.005 per ml.
The way to compare these is to find the cost per ml.
What is the cost per ml for the other box?

Arithmetic  Rosedala, Monday, April 12, 2010 at 5:17pm
Thank Ms. Sue!
I multiplied 750 x 12 = 9000
I divided 9000 by 12 = 0.00666
So...the smaller bottles are then more expensive despite the fact that the price tag is lower.
Thanks again a lot! :)

Arithmetic  Ms. Sue, Monday, April 12, 2010 at 5:27pm
Why did you divide 9,000 by 12?
You need to divide 9,000 ml by the total cost.

Arithmetic  Rosedala, Monday, April 12, 2010 at 5:40pm
Oh I'm sorry (I'll never get this into my cerebrum!)...
The lower price tag is indeed cheaper. This time I got 0.00444. This makes it one tenth of a cent cheaper?
I'll write this little formula for my future purchases. Thank you so much!

Arithmetic  Rachael, Saturday, July 3, 2010 at 11:28am
1 litre per bottle
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