A small bottle, a larger usable yield: compare the stated prepared amount
By Erik Nilsen · Kroni2 min read
If a product supplies a greater prepared amount than its bottle contents, your child should compare what will actually be used. Bottle volume and stated prepared yield answer different questions. Read the yield before dividing price by millilitres.
Use an invented label
In a hypothetical example, a concentrated craft product costs 20 units. Its bottle contains 50 millilitres, but the practice label states a prepared yield of 250 millilitres. A ready-to-use version contains 250 millilitres and costs 30. Both meet the same need, with necessary extras already included in the exercise costs.
The concentrate costs 20 / 250 × 100 = 8 units per 100 millilitres of prepared product. The ready-to-use option costs 30 / 250 × 100 = 12. For 250 millilitres, the difference is 30 − 20 = 10 units.
Dividing the concentrate price by only the bottle's 50 millilitres instead gives 40 per 100. That describes concentrate in the bottle rather than the prepared amount compared with the other item.
Check yield and actual need
A practical snag is assuming any small bottle represents five times its contents. Here the yield is known because the invented label explicitly states 250. Do not apply that to an actual product without correct information.
Your family must also check suitability and preparation requirements. This article provides price arithmetic rather than mixing instructions.
If your child needs only 100 millilitres and can buy a suitable ready-to-use pack for 14, that requires 6 less paid now than the bottle costing 20. A lower prepared-unit price is not always the lowest actual purchase amount.
Ask your family: “Are we comparing bottle contents or the confirmed prepared amount we need?”
Carry the calculation into your family agreement
Kroni can keep track of your child's virtual balance. The app does not transfer money, so any actual purchase is paid for outside it. Agree on what you will record, then check the amount with your child afterwards. Do not deduct a possible cost as though the purchase had already happened. Read about allowance in Kroni.
