Editing of videos

Hello,

My son is doing a dissertation for university and he needs to have three variations of the same video. The video will be identical except for the background music for the advert in the middle. It will be in the following format:
- short informational video (2 mins)
- advertisement (30 sec)
- short informational video (2 mins)

There need to be three versions of the video with the only change being the background music to the ad. versions as follows:
1. No background music
2. Upbeat background music
3. Downbeat background music.

Please can you let me know how much this would cost and also which services you offer (and the associated costs with each).

Option 1 - my son sends you all of the clips (informationals, advert, music clips) and you just put them together.
Option 2 - you prepare the informationals after a briefing and he sends you the advert and music clips (informationals are just general interest things like habits of penguins or something)
Option 3: You prepare all including finding the advert and music (my son can brief you on the type of ad, e.g. laundry detergent).

Thanks, I look forward to hearing from you. He needs this fairly quickly!

Best wishes,
Jeanette