Mobile Application - Financial Spreadsheet (Including auto populating formulas)

Thank for your interest. I would like a very clean and modern Iphone application. Its basically a spread sheet that makes calculations for you. Say you get paid weekly, and weren't sure what your can afford (budget). People always forget about their annual expenses. I would like to create a record keeping application to remind people of their upcoming expenses to better help them know what they can afford. So there would be a main spread sheet (well fitted to a phone screen) and it would break everything down for you on a weekly basis (if you're paid weekly). For instance: You pay $5000 per year for property tax annually, $1000 per month for automotive loan, and $100 bi-weekly on groceries. You would enter these in a different location, and this app you show you want you actually need to save (or what money is already 'spoken for'). So you would see this on your 'weekly expense' sheet. +$1000.00 (pay cheque) -96.15 (Property tax - Broken down to weekly) -230.77 (Auto Loan - Broken down to weekly) -50.00 (Groceries - Broken down to weekly) you have $623.08 remaining weekly that currently isn't 'spoken for'. Very simple. I would like the color green with a very modern feel. The app is name "Spoken For" (A financial Application for accurate budgeting, so you don't forget what money is already spoken for.) Please ask questions. I know it's a tough project. Thanks again!