A LaSalle University professor is suspended while school officials investigate reports that he hired scantily-clad strippers to perform at an extra-credit seminar last month at the Plymouth Meeting satellite campus. 57-year-old Jack Rappoport taught statistics at the business school.  The seminar was billed as a class on business ethics.  It ended ahead of schedule when Business School Dean Paul Brazina walked in and broke it up.  The students have been promised a refund of the $150 they paid to attend the class.