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Let's walk through the math problem you've uploaded:

### Problem Breakdown:
Marcus is trying to decide how much to charge for each brownie, taking into account the following costs that occur every six months:
1. **Shipping**: US$250
2. **Insurance**: 0.6% of the value of goods
3. **GST (Goods & Services Tax)**: 7% of the value of goods

In addition, the **exchange rate graph** (US dollars per Singapore dollar) is provided. We will use this information to calculate the total cost and convert it to Singapore dollars for each brownie.

### Calculations in the image:
1. The value of goods is **US$309.24**.
2. Insurance:  
   $ 0.6\% \times 309.24 = US\$1.86 $ (Rounded to 2 decimal places)
3. GST:  
   $ 7\% \times 309.24 = US\$21.30 $ (Rounded to 2 decimal places)

### Total Cost in US Dollars:
\[
US\$250 + US\$1.86 + US\$21.30 + US\$309.24 = US\$577.37
\]
This total represents all the costs for a six-month period.

### Number of Brownies:
Marcus makes **300 brownies** per month, so in **6 months**, he makes:
\[
300 \times 6 = 1800 \text{ brownies}
\]

### Cost per Brownie in US Dollars:
\[
\frac{US\$577.37}{1800} = US\$0.32
\]
Thus, the cost per brownie is approximately **US$0.32**.

### Exchange Rate:
Based on the graph, the average exchange rate for the past 2 years appears to be around **0.73 US dollars per Singapore dollar**.

### Cost per Brownie in Singapore Dollars:
Now, we convert the cost per brownie to Singapore dollars:
\[
\frac{US\$0.32}{0.73} \approx \text{SGD } 0.44
\]

### Conclusion:
A sensible amount for Marcus to charge in Singapore dollars per brownie would be around **SGD 0.44** to cover his costs.

Would you like a detailed breakdown of the exchange rate or further clarifications?

---

Here are 5 follow-up questions to deepen your understanding:
1. How would the cost change if the value of the goods was different?
2. What if Marcus ordered his ingredients every three months instead of six?
3. How would an exchange rate fluctuation affect the final price per brownie?
4. What would the total cost be if the GST rate increased to 9%?
5. How does the cost per brownie compare if shipping fees are reduced?

### Tip:
When working with percentages like GST and insurance, ensure to calculate them based on the value of the goods before adding them to the total cost for accurate results.

Marcus needs to decide how much he should charge in Singapore dollars for each brownie. He orders his ingredients once every six months. In addition to the cost of the ingredients, he has to pay for shipping, insurance, and GST. Using the provided exchange rate graph, calculate a sensible amount in Singapore dollars for him to charge for each brownie.

This problem involves calculating the cost per brownie Marcus should charge in Singapore dollars. It covers key concepts such as percentage calculation (insurance, GST), currency conversion using exchange rates, and cost per unit analysis. Suitable for students in Grades 10-12.

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