Averages of sales analysis


I've conducted an experiment in a supermarket with music in which I had 3 situations:

1. No music
2. Soft music
3. Loud music

I changed the situation every 3 hours during 6 days. Now the problem is that I did not recieve the right data from the manager. I wanted to get all of the reciepts, but he couldn't provide me with anything more than the count of customers and total sales for every hour. Now I'm a little bit stuck, beacase all I can get is an avarage sale per client during every hour, but I can't use averages with ANOVA, which I planned to do. I'm not a statistician - I work with music, and I'm a bit confused if there's any way to tell if the music had a significant effect on sales? Thanks for any advice!