WGU BS in Computer Science Degree Plan

[LevelUP]

you can do WGU's natural science lab in one weekend for less than $10              
just take 3 cups the same size, add the same amount of water to each
put no salt in one, one teaspoon in one and one table spoon in the last        
then put each in the freezer and see how long it takes for them all to freeze
make chart of your results
explain your results
done

So what is the $10 for? That's some premium salt you are using?  Much like premium air for car tires?