WHICH ONE IS NOT PROPORTIONAL PLEASE HELP

Mechanical pencils are sold in a package of 4 pencils for $3.52. Which statement is not proportional to this?

a single pencil for $0.88

two packages of 4 pencils for $7.04

Buy one package, get the second 50% off.

One small package, containing 2 pencils, costs $1.76.

Buy one package, get the second 50% off is proportional.

Step-by-step explanation:

4 divided by 3.52 is .88, so that is the base amount.

We know that a single pencil is .88, so that is right.

To find two packages, you would multiply one package by 2 (3.52 x 2)

To find the price of two pencils, you multiply the price of one pencil by two (.88 x 2) but is 1.76

The only one that does not fit is the buy one get one 50% off.