https://file.aiquickdraw.com/mathbot/file/1726720258557li1pvt6s.jpg

To solve the problem, we need to calculate the total amount Abe's customer owes for the order, including the Goods and Services Tax (GST).

1. **Price Calculation (excluding GST):**
   - **10 items at $5 each**:  
     $ 10 \times 5 = 50 $
   - **20 items at $10 each**:  
     $ 20 \times 10 = 200 $
   - **50 items at $20 each**:  
     $ 50 \times 20 = 1000 $

2. **Total price excluding GST**:
   \[
   50 + 200 + 1000 = 1250
   \]

3. **GST Calculation:**
   GST is typically 10% in countries like Australia, but this may vary depending on the location. Assuming a GST rate of **10%**:
   \[
   \text{GST} = 1250 \times 0.10 = 125
   \]

4. **Total amount (including GST)**:
   \[
   \text{Total} = 1250 + 125 = 1375
   \]

### Final Answer:
- **GST**: $125
- **Total cost (including GST)**: $1375

Would you like more details or have any questions?

### Related Questions:
1. How does the GST rate impact the total price?
2. If Abe wanted to give a 5% discount before applying GST, how would the calculations change?
3. What if only some items are GST exempt? How would the calculation be done then?
4. How do different countries calculate sales tax compared to GST?
5. How does rounding affect the final GST amount when prices are in cents?

### Tip:
Always confirm the local GST or sales tax rate before calculating, as it varies across regions.

Abe has to calculate the GST for a customer’s order. The order involves ten items at five dollars, 20 items at 10 dollars, and 50 items at 20 dollars. All these prices are GST exclusive.

Learn how to calculate the GST for an order with multiple items priced at $5, $10, and $20, with a GST rate of 10%. The solution covers basic multiplication, percentage calculation, and total cost including GST. Suitable for students in Grades 5-7.

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