Here are a few examples to get you started with using calculations in Intelligent Reports.
Add up all time spent on an issue selected as a report question named Issue, and display the answer in hours:
sum(questions.Issue."Work Log"."Time Spent in Seconds") / 60 / 60
Work out the amount to charge for an issue as time spent in hours multiplied by $90 per hour:
(sum(questions.Issue."Work Log"."Time Spent in Seconds") / 60 / 60) * 90
List all of the versions in all of the projects in JIRA:
all.projects.versions
A JQL query to list all open issues in the version of the project selected by the user creating the report as the answer to the question Version:
status = Open and project = {questions.Version.project}