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Let's calculate the percentage decrease in turnover per day in the Primary school based on the given information.

### Key information:
1. Every pupil who previously bought Sprite (45 pupils) is now switching to Water (which had 12 pupils initially).
2. The prices:
   - Sprite = £1.20
   - Water = £0.80
3. We are calculating for the Primary school only.

### Step 1: Calculate the current turnover for Sprite and Water.
- **Turnover for Sprite before switch:**
  \[
  \text{Turnover} = \text{Number of pupils} \times \text{Price per drink}
  \]
  \[
  \text{Sprite turnover} = 45 \times 1.20 = 54 \text{ GBP}
  \]

- **Turnover for Water before switch:**
  \[
  \text{Water turnover} = 12 \times 0.80 = 9.6 \text{ GBP}
  \]

### Step 2: Calculate the new turnover after switching.
Now, the 45 pupils who used to buy Sprite will switch to Water. So, the new turnover for Water is:
- **New Water turnover:**
  \[
  \text{New Water turnover} = (12 + 45) \times 0.80 = 57 \times 0.80 = 45.6 \text{ GBP}
  \]

### Step 3: Calculate the total turnover before and after the switch.
- **Total turnover before switch:**
  \[
  \text{Total before} = \text{Sprite turnover} + \text{Water turnover} = 54 + 9.6 = 63.6 \text{ GBP}
  \]

- **Total turnover after switch:**
  \[
  \text{Total after} = \text{New Water turnover} = 45.6 \text{ GBP}
  \]

### Step 4: Calculate the percentage decrease in turnover.
\[
\text{Percentage decrease} = \frac{\text{Total before} - \text{Total after}}{\text{Total before}} \times 100
\]
\[
\text{Percentage decrease} = \frac{63.6 - 45.6}{63.6} \times 100 = \frac{18}{63.6} \times 100 \approx 28.30\%
\]

So, the percentage decrease in turnover is approximately **28.30%**.

Would you like more details or have any questions?

Here are 5 related questions for further exploration:
1. What would be the turnover if pupils switched from Sprite to Juice instead of Water?
2. How would the turnover change if the prices of drinks were adjusted?
3. What would be the impact on turnover if pupils from both Primary and Secondary schools made similar switches?
4. How does the change in the number of pupils choosing other drinks affect the overall sales?
5. What is the total turnover for both Primary and Secondary schools combined before and after the switch?

**Tip**: Understanding percentage change is useful in evaluating the financial impact of choices and can be applied in various real-world business scenarios.

What is the percentage decrease in turnover per day in the Primary school if every pupil that chose Sprite before are now choosing Water instead?

Learn how to calculate the percentage decrease in turnover per day in a Primary school when pupils switch from Sprite (£1.20) to Water (£0.80). This problem covers basic arithmetic and percentage decrease, ideal for students in Grades 7-9.

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