My Math Forum SodaStream

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 December 5th, 2018, 06:02 AM #1 Newbie   Joined: Dec 2018 From: Australia Posts: 1 Thanks: 0 SodaStream Hi, I'm sorry, I'm not good at maths, so some help would be appreciated. Recently, I purchased a Soda Stream and I'd like to know what my break even point is. That is, how many litres do I need to make before I start saving money? I used to buy 1.25L Soda Water bottles from my supermarket for 90 Cents. Setup Cost: Sodastream cost \$107 including 1 60L Gas Cylinder I also purchased a 60L Spare Gas Cylinder for \$32. Plus I got 2 x 1L bottles costing \$15. Ongoing Cost: Each empty 60L Gas Cylinder can be swapped for another one for \$19. Thanks in advance, Adrian. Last edited by skipjack; December 5th, 2018 at 12:26 PM.
 December 6th, 2018, 02:23 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,633 Thanks: 2080 Welcome to the forum. I haven't done any calculations based on your data yet, but I once did similar calculations to assess whether I could ever break even. At the time, soda water could be bought very cheaply and the gas cylinder swaps weren't particularly cheap, so the answer then was that one never breaks even. Another issue is that when soda water is readily available, one tends to pay more attention to what you add it to, so your experiments can quickly use up a lot of ingredients. How much carbonated water can you make using one gas cylinder? Do you need to add anything to the water so as to offset the acidity of the carbonated water?

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