A receipt for a customer

A customer gets a sentence, not a shrug

Persiapan: a receipt is memory. Now you give it out. Lemonade 20 Kč, 12:04, stall 5.A. Even a slip. It is not an EET course. It is trust. A return of a bad cup with no slip goes worse.

Ondra: “you do not need paper, you trust me.” Nela a slip. A classmate claims. Nela has a sentence. Ondra has a quarrel. A queue trusts Nela.

Memory both ways

Your till needs a copy: ticks of a cup count. A customer a slip. Two memories. A hole from Cashier: 20 cups gone, 18 ticks. Look. Do not invent takings.

Nela wants to shorten it to “it will be fine somehow”. Ondra asks what the lesson A receipt for a customer is for, when a table can do a sum. A sum does not count respect, a PIN, a trap or an envelope. The core is: A slip: what, how much, when. Ticks in a till. Trust is paper.

Adults pay the rent. The card, the account and the PIN belong to a parent. A child’s email does not belong here. Pocket-money numbers do not belong on the network. If you break these rules in the lesson “A receipt for a customer”, you know a word, not the course.

15 slips × 20 = 300 takings. Cost 15×8=120. Profit 180. It sits with ticks. Ondra 300 in a head, 240 in a money box. A hole 60. Slips missing.

Practice numbers, not a bank statement. Nela has 80 Kč in the want envelope. Ondra pushes a step this lesson can name. When Nela uses the core, either it waits for a parent, or it fits the envelope. If not, anger and a hole are left — proof of pressure, not that the lesson is pointless.

Why this right now

You are in the course Money with Martin, level Till boss. You can write numbers in a notebook or a table, but the topic is money and decisions, not Excel formulas. The account, the card and the PIN belong to a parent. A child’s email does not belong here. Do not put pocket-money numbers on the network.

This is not the Sheets with Martin course. A table may help, but the mark of success is a decision, not SUM.

You will know this lesson by one sentence: A slip: what, how much, when. Ticks in a till. Trust is paper. When you can say it to a parent or a teacher, you have the core. The rest is practice, not magic.

VAT/school: a teacher says whether a slip is enough. First a habit. Then tax in one sentence again.

If you skip this, the next lesson in level Till boss will stand on fog. A practice slip exists. You can do 15×12 profit. IČO on it is not. It is not a test for marks. It is a safety net, so “A receipt for a customer” is not only a heading.

Four things you will build from the course

The course has four small projects. You do not have to do them all at once. Today you add only what this lesson can do.

Workshop: one slip

Practice: lemonade 20 Kč, time, a stall. With no IČO.

1. Write a sentence.

2. A tick for a till.

3. 15×20 and 15×8. Profit?

4. A hole 60: look, do not invent.

You count with a sentence and a tick. A shrug is Ondra’s till. A queue does not trust a shrug.

Pocket money: A pocket-money notebook vs. a stall slip — do not mix. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Class trip: A trip: a trip-till slip. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Game shop: A game: a gem receipt is a parent’s email, not your stall. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Stall: A project: slips in an envelope. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

What to tell a parent with no wage and no account number: “Today I went through a receipt for a customer — A slip: what, how much, when. Ticks in a till. Trust is paper.” If they have no time, a slip in the notebook is enough. Stories and class chat are not enough.

Three pieces on a slip. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

Ticks = a count. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

A hole is looked for. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

Three nos here too: do not chase a ranking, do not bypass a payment lock, do not carry blame for rent. When someone hurries for a code from an SMS, those are Banker and Sceptic doors, not a workshop in a rush.

Practice: paper, or faith?

What holds a claim?

1. A slip 20 Kč 12:04. Yes?

2. Trust me. Why weak?

3. 15 ticks vs. 18 cups. What?

4. IČO onto a child’s slip. Why not?

Now you 💪

Go through three checks. By each one, tick in your head: do I see it, or not?

1. Three pieces on a slip.
2. Ticks = a count.
3. A hole is looked for.

If something is missing, go back to the steps above. It is not a test for marks. It is a safety net, so you go on with certainty, not with a mess.

What to take from this lesson

• You give out memory.
• Ticks watch a hole.
• With no IČO.
• Trust of a queue.
• Namas in the examples (Nela, Ondra) are made up. Do not put your number, email or photo here.
• Next lesson: When you can do this, go to the next lesson in the same level.

© 2026 Ing. Martin Polak / AlgoRhino · Ketentuan penggunaan konten