convert simple excel formula to functional PHP script!

Hello PHP Coders, I am a member of a great online program where I am investing my money and it will earn 2% daily rebates for 75 days. The minimum investment is $10 and whenever I have $10 or more (in multiples of 10's) I can invest or re-invest the 2% daily rebates until it compounds. I have created an excel spreadsheet just to demonstrate the process so I can project and track when my investments gets doubled or how much I've earned daily rebates so far for 75 days or how much my investments have reach in one year time. Please visit my site at <[login to view URL]> and download the excel spreadsheet to get an idea of how the formula works. I want you to create a php script that I can upload to my site so that members will just have to go to my site and use the online calculator instead of downloading the excel sheet. So if you have downloaded the spreadsheet in my site and open it in excel, you can input the amount in the principal area say $1,000 (minimum $10) for the principal and automatically the spreadsheet generates the daily rebates and the compounding per day for one year! I want that same functionality to be in PHP. And as the formula is already given to you (in excel), I believe its very easy to just convert it into valid and fully functional php script. I am not interested in the design, I am just interested in the functionality of it just as you see in the excel file. All interested bidders are welcome but here's how it will work: I want the interested bidder to do this project and post it in his/her server so I can test the functionality live! from there, I can comment if necessary so I am sure you are doing what I am expected. the first bidder who can show me the link where he posted the php script and that is correct or close to what I expect wins! goodluck and have fun!