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The problem presented is about comparing the costs of electricity using different payment systems. Here's what I can see from the image:

### 1. Table Overview
The table compares two electricity systems: Prepaid and Postpaid. The given information includes:

- **Fixed monthly cost**:
  - Prepaid: R0.00
  - Postpaid: R385.85

- **Cost per unit (kWh)**:
  - Prepaid: 118.65 c/kWh (if ≤ 600 kWh), 174.10 c/kWh (if > 600 kWh)
  - Postpaid: 103.05 c/kWh (if ≤ 600 kWh), 174.10 c/kWh (if > 600 kWh)

The VAT (Value-Added Tax) of 15% is included in the price.

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### 2. Questions

**2.3.1**: Determine the fixed monthly cost for the prepaid system.
- Fixed monthly cost for **prepaid** is already provided as **R0.00**.

**2.3.2**: If a household uses 726 kWh of electricity in one month, compare how much they would pay for electricity using both systems.

Let's break this into two parts (Prepaid and Postpaid) and calculate the costs:

- **Prepaid system**:
  - For the first 600 kWh, the cost is \( 600 \times 118.65 \) c/kWh.
  - For the next \( 726 - 600 = 126 \) kWh, the cost is \( 126 \times 174.10 \) c/kWh.
  
  Total cost (in cents): 
  \[
  600 \times 118.65 + 126 \times 174.10 = 71190 + 21936.6 = 93126.6 \, \text{cents} = R931.27
  \]

- **Postpaid system**:
  - Fixed monthly cost = R385.85.
  - For the first 600 kWh, the cost is \( 600 \times 103.05 \) c/kWh.
  - For the next 126 kWh, the cost is \( 126 \times 174.10 \) c/kWh.

  Total cost (in cents):
  \[
  600 \times 103.05 + 126 \times 174.10 = 61830 + 21936.6 = 83766.6 \, \text{cents} = R837.67
  \]
  
  Adding the fixed monthly cost:
  \[
  837.67 + 385.85 = R1223.52
  \]

**2.3.3**: A household bought electricity for R823 (including VAT), on the prepaid system. Determine how much electricity they can use.

To calculate the total units, we’ll divide the total money spent by the unit costs. First, we'll check how many kWh can be purchased at each rate:

- If they buy up to 600 kWh at 118.65 c/kWh:
  \[
  \text{Cost for 600 kWh} = 600 \times 118.65 = 71190 \, \text{cents} = R711.90
  \]
  This leaves \( R823 - 711.90 = R111.10 \) for units at 174.10 c/kWh:
  \[
  \text{Additional units} = \frac{11110}{174.10} \approx 63.82 \, \text{kWh}
  \]

Thus, the total electricity they can use is \( 600 + 63.82 = 663.82 \, \text{kWh} \).

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Would you like further details or explanations on any of these solutions?

### Related Questions:
1. What would be the total cost of electricity if a household used 500 kWh on the postpaid system?
2. How much would a household pay on the prepaid system if they used 450 kWh?
3. How does the VAT impact the total cost of electricity in these systems?
4. What is the percentage difference between the prepaid and postpaid systems when using 726 kWh?
5. If VAT were reduced to 10%, how would the prices change for the prepaid system?

### Tip:
When dealing with utility bills, always remember that VAT is included in the final cost and can have a significant impact on your total expenses!

Electricity cost comparison using prepaid and postpaid systems. Given a table of rates and VAT-inclusive prices, determine various costs and comparisons based on specific electricity usage scenarios.

Explore how to calculate and compare electricity costs between prepaid and postpaid systems with VAT. Solve practical problems involving unit rates, fixed monthly costs, and percentage calculations for electricity consumption up to 726 kWh and more. Suitable for high school students in Grades 10-12.

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