Project-chapter 3. pg. 39. exercise #4

Create a project called TipCalculator

• The main activity layout should contain one EditText, three buttons, and one TextView
• The first button should be labeled 15% and should take the amount entered in the EditText and calculate 15% of that value.
• The second button should be labeled 18% and should take the amount entered in the EditText and calculate 18% of that value.
• The third button should be labeled 20% and should take the amount entered in the EditText and should calculate of that value.
• All the buttons should display the tip and total bill in the TextView with this format: Tip: $99.99, Total bill: $99.99.
• The widgets should be centered horizontally in the screen with the EditText on top, the button below it in a single row, and the Textview below the button.