build an app

Build an IOS and android app, specifically to track trip purchases, saved by flight date. Categorise and total purchases, then show a filled out form for visual reference. Options for printing and PDF. Purpose is to provide a free service that I can use to brand my company and generate advertising income via placed ads from local businesses. The uploaded form is the end result for display/print. Signature field etc would not be filled out, flight, address items categories etc would. I envision a list of trips as the major view, then items purchased as the sub view displaying store price and category. This is where the main data entry form would be launched. User would choose the category as part of the process of saving a purchased item. At the end would be a duty calculation of 25% with an allowance of : If you are arriving as a passenger, you have a duty free allowance on accompanied personal tobacco products and alcoholic beverages not exceeding 200 cigarettes, 50 cigars, 0.5 kg of tobacco, one litre of wine and one litre of spirits. If you are a visitor you also have a duty free allowance of up to $50 on other accompanied personal goods that will remain . If you are a Bermuda resident or are otherwise entitled to reside you also have a duty free allowance of up to $200 on other accompanied personal goods that were acquired by you while outside . Centralised Advertising management will need to be part of the solution. Please provide your project methodology and rough outline Detail what language you will be using and if you will have a common codebase. Detail how you will handle ongoing support and maintenance of the application, including hourly rates. Provide references for iOS and android apps.