Customer Service That Brings Repeat Buyers

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I'm learning "Customer Service That Brings Repeat Buyers" on The Future Market. Lesson 1: "Why repeat buyers matter".

What the lesson teaches:
- A repeat buyer already trusts you, so you don't have to pay again to find them.
- Repeat purchase rate = customers who bought more than once ÷ all customers × 100.
- Customer lifetime value (CLV) grows when people buy again (see course 3.1 for the formula).
- Fred Reichheld of Bain & Company (who later created the Net Promoter Score, Lesson 4) wrote in 2001 that "small increases in customer retention soon translate into big boosts to profits."
- Example of a company built around service: Amazon's first leadership principle is Customer Obsession, which says leaders start with the customer and work backwards.

The exercise I'm working on:
Count your customers from the last 3 months (or imagine 20). How many bought more than once? Calculate your repeat purchase rate.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "Why repeat buyers matter" from the course "Customer Service That Brings Repeat Buyers".

Here's what the lesson says:
A friend who comes back to your lemonade stand every Saturday is worth more than one stranger who stops once. Being kind and helpful is how you get friends to come back.

The activity:
Count your customers from the last 3 months (or imagine 20). How many bought more than once? Calculate your repeat purchase rate.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.