How to add a report parameter to let user choose < (less than), > (greater than), or all records

I have  pretty basic report that select employee time sheets.  I want to add parameter that lets the user filter on the HoursWorkedPerWeek column.  I want them to be able to choose to select only records with < 40 hours, > 40 hours, or all records.  I can get the numeric part of the WHERE clause from a parameter no problem, but not sure how to handle the different/changing  operators (<,>, etc.)

Thanks!