Quick php script - online debt tracker

I have a small programming assignment. A friend owes me about $100 he is paying me back very slowly, so I have decided to charge him some interest. The project is to make a php script that allows me to do a couple of things: enter the amount he owes me and compound the interest to the principle daily Select a date from which principle will be calculated from Enter and record payment amounts so the principle goes down by that amount Allow for multiple loans, so if I lend more money to another friend and account can be created for him to log in and will keep track of that new loan. This is very simple php programming and I am too lazy to do it, so I am willing to pay! - The first $30 bid gets it and if you do great work, I have more work for you!