This question may be very easy to answer; but unfortunately I cannot find the method to solve my issue

 

This is what I am trying to do it in the Crystal report:

 

Assume that I have totally 1100 customers and out of them 230 customers are listening music from their IPOD, 250 of them listening music from their MP3 player and remaining them using radio to listen music. I need to show the ratio as like below

 

Total MP3 users are = 230 /1100

 

this looks very simple. However my problem is when I filter the data based on their usage (example: MP3) the data is filtered by MP3 and I cannot get the total amount of Customers.

 

How to get both in one report?

 

Please help me