Display the sum of participant selections at top of survey page

Trying to add html or javascript to a Qualtrics that will provide a sum of the selections someone has made, by displaying the running total at the top of the page (that updates with each choice or change in choice).

So for example, Participants are asked: Which chair do you choose?

Chair 1 ($20.00)
Chair 2 ($30.00)
Chair 3 ($40.00)
[participants pick a chair, total appears at the top...they select a different chair, the total updates],

Then they are asked What table do you choose?

Table 1 ($30.00)
Table 2 ($40.00)
Table 3 ($50.00)
[participants pick a table, total appears at the top (With the sum of the pick for their chair AND their table).]

Etc.
(We will be summing three total items)