THE NUMBERS, EXPLAINED
How to use this calculator.
Cumulative issued/returned counts for a closed record period. Deposit liability equals deposits collected on issues less refunds already made; refunds still due relate only to recorded returns.
Start with your inputs
Enter trays issued by customer, trays returned by customer, deposit per tray, deposits already refunded by customer. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Trays issued by customer | 20,15 |
| Trays returned by customer | 15,10 |
| Deposit per tray | 5 |
| Deposits already refunded by customer | 50,25 |
A worked example
With the example inputs above, outstanding trays by customer is 5, 5. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Outstanding trays by customer | 5, 5 |
| Refund still due by customer | 25, 25 |
| Total deposit liability | 100 |
How this is calculated
Outstanding trays by customer
Subtract returned trays from issued trays.
Refund still due by customer
Value returned trays at deposit rate and subtract refunds already paid.
Total deposit liability
Subtract refunded deposits from deposits originally collected.
Symbols and units
- a
- Trays issued by customer
- b
- Trays returned by customer
- c
- Deposit per tray
- d
- Deposits already refunded by customer
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Cumulative issued/returned counts for a closed record period. Deposit liability equals deposits collected on issues less refunds already made; refunds still due relate only to recorded returns.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Outstanding trays by customer; Refund still due by customer; Total deposit liability. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Cumulative issued/returned counts for a closed record period. Deposit liability equals deposits collected on issues less refunds already made; refunds still due relate only to recorded returns.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Solve proportions and their applications ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →