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 How much extra is received? $$ \$ $$

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To solve the problem, we need to determine how much extra the salesperson receives from selling 210 items, given the conditions provided.

### Known Conditions:
1. Weekly salary: $$ \$ 500 $$ (not necessary for calculating extra earnings)
2. Payment for every item sold in excess of 200 items: $$ \$ 30 $$
3. Number of items sold: 210
4. Threshold for extra payment: 200 items

### Steps to Solve:

1. **Determine the number of items sold in excess of 200:**
   $$
   \text{Excess items} = \text{Total items sold} - \text{Threshold} = 210 - 200 = 10
   $$

2. **Calculate the extra earnings from the excess items:**
   $$
   \text{Extra earnings} = \text{Excess items} \times \text{Payment per excess item} = 10 \times 30
   $$

Now, let's calculate the extra earnings:

$$
\text{Extra earnings} = 10 \times 30 = 300
$$

### Conclusion:
- The piece of information that is not necessary to solve the problem is the **weekly salary** of $$ \$ 500 $$.
- The extra amount received from the sale of 210 items is $$ \$ 300 $$.

Thus, the final answers are:
- **Unnecessary information:** Weekly salary
- **Extra received:** $$ 300 $$
The weekly salary is not needed to solve the problem. The salesperson earns an extra \$300 from selling 210 items.

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