Mr Imani wants to purchase paper and notebooks for his classroom. At Dollar DIscount he can buy packs of paper, p, for $1.25 each and notebooks, n, for $2.50 each. This modeled by 1.25 p + 2.50 evluate p = 10 and n = 30 to find how much it will cost Mr. Imani purchase 10 packs of paper and 30 notebooks.

To find the total cost for Mr. Imani to purchase 10 packs of paper and 30 notebooks, we can use the following equation based on the prices given:

\[
\text{Total Cost} = 1.25p + 2.50n
\]

Where:
- \( p = 10 \) (packs of paper)
- \( n = 30 \) (notebooks)

Now, substituting the values into the equation:

\[
\text{Total Cost} = 1.25(10) + 2.50(30)
\]

Calculating each part:

1. For the packs of paper:
\[
1.25 \times 10 = 12.50
\]

2. For the notebooks:
\[
2.50 \times 30 = 75.00
\]

Now, add those two results together to get the total cost:

\[
\text{Total Cost} = 12.50 + 75.00 = 87.50
\]

Thus, the total cost for Mr. Imani to purchase 10 packs of paper and 30 notebooks is **$87.50**. Therefore, the correct answer is:

**$87.50**