Joint Frequency because of the fact that it "joins" one number from the column(up and down) and one from the row(side-by-side), hence the two-way table.
Try 42 love :D hope this helps
X=25 is the correct answer
I believe you're right with what you have
the price decrease being 5% (the .95) and the increase by 15% (the 1.15)
