Build me a calculator in the form of a wp-plugin. You will get the formula/alogrithm and the design elements.
The calculator is basically a copy of www.splittester.com. Check it out to get a better idea of the calculator and how the answers are generated and displayed.
Also take a look at the file I've attached to get a better idea of the project.
Before you bid be sure that you have the skills to complete the task and discribe exactly what you will deliver upon completion and how you are going to do it.