Update repres.md

Author: dkillian

repres.md

@@ -7,7 +7,8 @@ permalink: /repres/
 - [Turning a RPubs document into a Github website walkthrough](https://github.com/thoughtfulbloke/appleorange)
 - [Introduction to knitr with rmarkdown](https://sachsmc.github.io/knit-git-markr-guide/knitr/knit.html)
 - [Trends and severity of Data Breaches](http://rpubs.com/ww44ss/29389)
+- [Benefit-cost analysis of a park user fee](https://github.com/dkillian/dkillian.github.io) 
 
 ## Comprehensive Notes
 
-- Complete notes for [Reproducible Research](http://sux13.github.io/DataScienceSpCourseNotes/)
+- Complete notes for [Reproducible Research](http://sux13.github.io/DataScienceSpCourseNotes/)