To determine the cost for 1 pencil, you can take the cost of the pencils at any quantity and divide it by the number of pencils.
Using the smallest quantity (6 pencils) as an example:
Cost for 6 pencils = $1.50
Cost per pencil = \( \frac{1.50}{6} = 0.25 \)
Therefore, the cost for 1 pencil is $0.25.