Write an iPhone application

Here is the work for someone who is familiar with process creating mobile apps using excel file and spreadsheet converter. I'm looking to create an iOS app using existing excel calculator, attached PRD and following specs: 1. iPhone/iPad/Android mobile/tablet devices with single orientation 2. Will there be back end from where you want to manage the data or you want a standalone App.​ - stand alone, no back end​ [login to view URL] the Back End admin be defining the parameters, value ranges for each field, messages etc…?​ no back end, there will be a settings page to manage parameters from the device​ 4. this will be hosted on the App store. 5. Will there be user management, login, registration, profile, my account etc…. ​ - no user management​ 6. there won't be notifications and push messages at this time. 7. I would like to save reports in PDF and excel format 8. ​I would like to also implement spreadsheet converter ([login to view URL]) , so in a future, I can easily update formulas without rebuilding whole app again. 9. Retina support is not necessary 10. I will provide all templates for buttons and background. Will use very simple design 11. I need to have system generated messages or pop ups for incorrect values entry into the fields, Notifications, Send Email to a specific Email id etc. 12. Entered values must be saved, allowing moving from screen to screen without loosing it. 13. Main thing: I want to be able to manage all excel formulas myself even after app is complete. In a bid please outline payment schedule and milestones. Estimate completion time Suggest proper and most effective way how to manage databases. Be able to provide complete list of images necessary