Calculate percentage for each value in a list

[faithhay]

I am compiling some questionnaires, and need to calculate the percentage of each item in a value list out of the total number of records. For example, radio buttons for ages: 13 - 17, 18 - 28, 29 - 39, etc., I need to create a script that will calculate the percent of total records for each age grouping.

Another example, using checkboxes for interests: outdoors, art, music, fitness, etc., where more than one box may be checked. Again, I need to create a script to calculate the percent of total records for each interest.

Also, how do I deal with the "other" items?

I'm thinking there must be a relatively easy way to do this, but I don't know how.