Zip Plus is a company that adds bar codes to US Mail. They charge 100 for the first 500 pieces plus 10 cent for each additional piece

To calculate the cost for adding bar codes to a specific number of US Mail pieces, let's break down the pricing information provided by Zip Plus:

- The company charges $100 for the first 500 pieces.
- For each additional piece after the initial 500, they charge $0.10.

Let's assume we want to add bar codes to 700 pieces of US Mail. We can calculate the cost as follows:

1. Calculate the cost for the first 500 pieces:
Cost for 500 pieces = $100

2. Calculate the cost for the remaining 200 pieces:
Cost for 200 pieces = 200 * $0.10 = $20

3. Calculate the total cost:
Total cost = Cost for the first 500 pieces + Cost for the remaining 200 pieces
Total cost = $100 + $20 = $120

Therefore, the cost for adding bar codes to 700 pieces of US Mail would be $120.