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Arithmetic

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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 -

    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 -

    I'm sorry Ms. Sue, but I'm an arithmetic-challenged 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 -

    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 -

    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 -

    Why did you divide 9,000 by 12?

    You need to divide 9,000 ml by the total cost.

  • Arithmetic -

    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 -

    1 litre per bottle

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