Given:
a.) Ms. Callahan has 50 gel pens for her art classes.
b.) 6 of the gel pens are blue.
We get,
[tex]\text{ \% of Blue Gel Pens = }\frac{\text{ No. of Blue Gel Pens}}{\text{ Total Number of Gel Pens}}\text{ x 100}[/tex][tex]=\text{ }\frac{\text{ 6}}{\text{ 50}}\text{ x 100}[/tex][tex]\text{ = 0.12 x 100}[/tex][tex]\text{ \% of Blue Gel Pens = 12\%}[/tex]Therefore, 12% of Ms. Callahan's gel pens are blue.