Meena's Quick Spin

I spin this wheel with my customers when a group buys notebooks and pens, and it tells them who pays what.

Who this is for

Meena Kulkarni runs Shree Stationers, a nine-foot-wide shop opposite a school gate in Sangli. Her busiest forty minutes are from eight in the morning till the second bell. Four friends dump twelve notebooks, a geometry box and a fistful of gel pens on her counter, the bill comes to 640 rupees, and then they stand there arguing about who owes what while eleven other children wait behind them.

How the job is done today

Meena divides on her calculator and says 160 each. One boy has a 500 note and no one has change. One says he only took two notebooks so why should he pay the same. One has nothing and says he will bring it tomorrow, so she writes his name on the back page of her bill book and forgets to ask him for four days. Usually the boy with money pays her the whole 640 and then chases the other three in their WhatsApp group all week, and by Friday he is annoyed with them and they are annoyed with him. The queue keeps growing the whole time.

The screens, in order

1. The counter total — Meena types what the bill came to, before anyone at the counter has time to start arguing.
2. Who is playing — Three or four first names go in, tapped from the ones she uses every morning or typed fresh in a few seconds.
3. The wheel — Each child gets one tap and one spin, and this is the part they came for.
4. Who pays what — One card, big letters, name and amount, readable by a boy standing on the other side of the counter.
5. Ticking off — Meena taps each name as the cash or the UPI comes in, so she knows the round is closed before the next group steps up.

What it keeps track of

• A round — the total on the counter, which day and time, whether it finished or was abandoned halfway
• The players in that round — first name, the amount the wheel gave them, paid or still standing there
• Names she uses often — first name, last time it was used, so the regulars do not have to be typed again every morning

The one decision that matters

Should the wheel be honestly random, or should it be quietly held inside a fence. Honestly random is more fun to watch, but on a 640 rupee bill it can land one child with 500 and that child's mother comes back the next day. Fenced means the app decides the four amounts first, always adding up to the exact bill, never giving anyone less than half or more than double an even share, and then the wheel simply reveals them. Go with the fence. Nobody at the counter can tell the difference, the drama survives, and Meena never has to explain to a parent why her shop charged one boy 500 rupees for two notebooks.

What to leave out of the first version

Leave out any record of money owed across days. No pending list, no reminders, no running total for a name. The whole point is that the round ends at the counter with cash or a scan. The moment the app starts remembering that Sarthak owes 90 rupees from Tuesday, it stops being a game and becomes a debt book, and children stop wanting to play a debt book. Meena already has a bill book for the boys she trusts.

How you would know it worked

One morning a group of four puts their notebooks on the counter and asks for the wheel before Meena reaches for it. And the boys behind them in the queue do not sigh, because the whole thing was over before they finished picking their pens.

Build it

Paste this in and let it run.

I run a stationery shop opposite a school in Sangli, and children come in groups of three or four and buy notebooks and pens together, then argue about who pays what. Make me a spinning wheel game for my phone where I type the total bill, say 640 rupees, add three or four first names, and each of them taps to spin their own turn. The wheel gives each one a different amount, some more some less, but the amounts must always add up to exactly the bill and nobody should land on a wildly unfair share. Then show a big result card with each name and their amount, let me tick each one off as they hand over cash or scan my QR, and the whole round should be over in about a minute and a half. Keep the letters big enough to read from across the counter, and remember the names I type often so I am not typing them again every morning.