Calculating percentage based on radio button custom field

[Nagaraju Reddy]

Can you research what our options are for creating calculated custom fields?  For example, let’s say there are 10 story issues in a release  and we want to get a percentage breakdown by ‘Business Case’(i.e radio button custom field) - 7 issues are “Maintenance”, 1 is “Requirement”, and 2 are “Development”.  What are our options for pulling this info so that the output shows 70%, 10%, and 20%?  

[Nic Brough -Adaptavist-]

Use one of the scripting add-ons that provides scripted or calculated fields.