For each row, multiple the first column ($) with the second column (%) and the answer goes on the third column.
For example (Calculator);
$9.60 x 25% = $2.40
The answer above would go on the third column.
Because the first three are examples of markup, you add that $2.40 with the original price and that answer goes on the last column.
The bottom three, you'd repeat the process, but rather than adding the discount and original, you are subtracting.
Let me know if I need to elaborate a little more and I hope this helped a bit!