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The question reads:

**A person bought 12 pens for $20. How many pens should he sell for $12 to make a 20% profit?**

### Step-by-step solution:

1. **Cost per pen**:
   \[
   \text{Cost per pen} = \frac{20}{12} = 1.6667 \text{ dollars per pen}.
   \]

2. **20% profit**:
   To make a 20% profit, the person should sell each pen for:
   \[
   \text{Selling price per pen} = 1.6667 \times (1 + 0.20) = 1.6667 \times 1.20 = 2 \text{ dollars per pen}.
   \]

3. **Pens sold for $12**:
   Now, to make $12, the number of pens sold would be:
   \[
   \text{Number of pens} = \frac{12}{2} = 6 \text{ pens}.
   \]

Thus, **he should sell 6 pens** for $12 to make a 20% profit.

The correct answer is **6** (Option B).

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Would you like further clarification or details? Here are some related questions to expand on the concept:

1. What would be the profit if he sold all 12 pens at $2 each?
2. How much would he need to sell one pen for to achieve a 25% profit instead?
3. What is the percentage profit if he sells all 12 pens for $30?
4. How does a change in cost price affect the number of pens sold to make a profit?
5. If he bought the pens for $15 instead of $20, how would that change the number of pens he needs to sell?

**Tip**: When dealing with percentage profit, always remember to multiply the cost by $1 + \frac{\text{profit percentage}}{100}$ to find the selling price.

A person bought 12 pens for $20. How many pens should he sell for $12 to make a 20% profit?

Learn how to calculate the number of pens needed to be sold to achieve a 20% profit. The problem involves basic profit calculations, percentage, and ratio concepts. Suitable for students in Grades 7-9.

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