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Let's go through the math problem step by step.

### Given:
- The shopkeeper bought **50 kg of rice**.
- He paid **$12 per kg**.
- He packed the rice into smaller bags weighing **250 g each** for retail.
- He sold the smaller bags at **$4.50 per bag**.

### Questions:
**a) How many bags of rice did he have for retail?**

We know that:
1 kg = 1000 g, so:
\[
50 \text{ kg} = 50 \times 1000 = 50000 \text{ g}
\]
Each bag weighs 250 g, so the number of bags is:
\[
\text{Number of bags} = \frac{50000}{250} = 200 \text{ bags}
\]

**Answer for (a):** 200 bags.

---

**b) How much money did he collect if he sold all the bags?**

He sold each bag for $4.50. The total money collected is:
\[
\text{Total money} = 200 \times 4.50 = 900 \text{ dollars}
\]

**Answer for (b):** $900.

---

**c) Express his profit as a decimal fraction of the cost price.**

1. **Cost price**:
   He paid $12 per kg for 50 kg, so:
   \[
   \text{Total cost price} = 50 \times 12 = 600 \text{ dollars}
   \]

2. **Profit**:
   The total revenue from selling all bags was $900, and the cost was $600, so:
   \[
   \text{Profit} = 900 - 600 = 300 \text{ dollars}
   \]

3. **Profit as a decimal fraction of the cost price**:
   \[
   \text{Profit fraction} = \frac{300}{600} = 0.5
   \]

**Answer for (c):** 0.5

---

Would you like any further explanation or details?

### Related Questions:
1. If the shopkeeper had packed bags of 500 g each, how many bags would he have?
2. What would his profit percentage be instead of a decimal fraction?
3. How much would he collect if he sold each bag for $5 instead?
4. What would be his loss if the cost of each bag was $4.50?
5. How much did he pay per bag based on the 200 bags packed?

**Tip:** Always convert units (kg to g, etc.) consistently to avoid mistakes in multi-step problems!

A shopkeeper bought 50 kg of rice from the wholesale market. He paid $12 per kg for the rice. He packed the rice in smaller bags each weighing 250 g for retail. How many bags of rice did he have for retail? He sold the smaller bags of rice at $4.50 per bag. How much money did he collect if he sold all? Express his profit as a decimal fraction of the cost price.

A shopkeeper bought 50 kg of rice and sold it in 250 g bags for $4.50 each. Learn how to calculate the number of bags, the total revenue, and the shopkeeper's profit as a decimal fraction. This math problem involves basic arithmetic, unit conversions, and profit calculations.

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