I was just curious how much I would be saving by mixing my own Red Bull-like energy drink using a Sodastream.
Change these to fit your situation.
tax rate = 9.375% serving size = 12 fl oz servings per year = 100 retail price = $2.99 mix price = $6.99 co2 price = $14.99 water price = $6.99 water capacity = 5 gal
Your really shouldn’t have to mess with this, but you can see how I get my numbers.
taxed retail price = retail price * (100% + tax rate)
We start with the price per serving for the syrup.
taxed mix price = mix price * (100% + tax rate) mix servings = 50 * 8 fl oz / (serving size in fl oz) mix price per serving = taxed mix price / mix servings => $0.2294
This calculates how much the carbon dioxide is going to cost. It assumes the advertised servings is accurate and that you carbonate to the suggested 3 farts (“buzzes”).
taxed co2 price = co2 price * (100% + tax rate) co2 capacity = 60 liters in fl oz co2 servings = (co2 capacity in fl oz) / (serving size in fl oz) co2 price per serving = taxed co2 price / co2 servings => $0.097
Notice how I’ve been converting everything to fluid ounces. It shouldn’t make any difference in the end, but Calca seems to like everything in the same units. Also, I’m in the US and we seem to like ounces and other silly units.
taxed water price = water price * (100% + tax rate) water servings = (water capacity in fl oz) / (serving size in fl oz) water price per serving = taxed water price / water servings => $0.1433
sodastream price = mix price per serving + co2 price per serving + water price per serving => $0.4697
percent of retail = sodastream price / taxed retail price * 100 => 14.362
yearly retail = taxed retail price * servings per year => $327.0313 yearly sodastream = sodastream price * servings per year => $46.9682
yearly savings = yearly retail - yearly sodastream => $280.063