To find how much it will cost Mr. Imani to purchase 10 packs of paper and 30 notebooks, we will evaluate the expression \( 1.25p + 2.50n \) using the values \( p = 10 \) and \( n = 30 \).
Substituting the values into the expression:
\[ 1.25(10) + 2.50(30) \]
Calculating each term:
\[ 1.25 \times 10 = 12.50 \] \[ 2.50 \times 30 = 75.00 \]
Now, add the two results together:
\[ 12.50 + 75.00 = 87.50 \]
Thus, the cost for Mr. Imani to purchase 10 packs of paper and 30 notebooks is $87.50.