Tip Calculator00

General Notes: (1) Every challenge the instructor and the course TA will give you an initial app evaluation mark but this mark will be made final after going through your code on the D2L. (2) The student must demonstrate the solution to the challenge at Lab 2 on his or her own laptop with hooking it to the LCD Projector of the ATAC 4004 (VGA Port is required-If you do not have it in your laptop try to find an adaptor) (3) The student must use Chrome Ripple Emulator to demonstrate the app. Requirements 1. Use the Sencha Ext JS version 6 (or higher). 2. You should use the MVVM or MVC Model in your app design. 3. The user should not be allowed to edit or change the tip amount and the total. 4. Use your imagination and make your app useful and interesting and it should run on Ripple. You are required to provide a README file explaining how to configure and run your solution to this challenge including some screen shots. You need to submit the solution package as Zip file to D2L.