A salesperson receives a weekly salary of $$ \$ 500 $$. In addition, $$ \$ 30 $$ is paid for every item sold in excess of 200 items. How much extra is received from the sale of 210 items? Which piece of information is not necessary to solve the problem? Weekly salary $$ \$ 30 $$ fee paid for every item in excess Number of items sold 200 threshold None of the information provided

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To determine how much extra the salesperson receives from selling **210 items**, let's analyze the necessary information:

1. **Weekly Salary ($500):**  
   - **Not needed** for calculating the extra amount earned from additional sales. It only provides the base income.

2. **$30 Fee for Every Item in Excess of 200:**  
   - **Essential** for calculating the extra earnings. This rate determines how much is earned per additional item sold beyond 200.

3. **Number of Items Sold (210):**  
   - **Essential** to determine how many items are sold beyond the 200-item threshold.

4. **200 Threshold:**  
   - **Essential** to identify at which point the extra earnings start.

**Calculation of Extra Earnings:**
$$ \text{Extra Items Sold} = 210 - 200 = 10 $$
$$ \text{Extra Earnings} = 10 \times \$30 = \$300 $$

Since the **weekly salary** is not required to compute the extra earnings from the additional sales, it is the piece of information **not necessary** for solving the problem.

**Answer:**  
**Weekly salary**
**Weekly salary** is not necessary to solve the problem.

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