ANOVA question

I have a question about two-way ANOVA.
Here is my experiment.
There are two groups of sucjects A(n=50) and B(n=60).
Each subjects has to test five different concentrations of a solution (5%,10%, 20%, 40%, 80%). When a subject tastes a solution, he gives it a score how he likes it (from 1 to 10).
I need to analyze how the ratings depend on group and solution.
I am using a two-way ANOVA.
What would be the correct df for this problem?
The total df.-- IS it 110-1? But the total number of observations is 5 * 110... stat package gives me total df 554. Did I enter the data wrong?
Also, what if an interaction of the two factors is significant, can I perform any comparisons between different factor/level combinations? If yes, with what test?