ActivityMain.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Previous Expense"
        android:id="@+id/prevExpense"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="29dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Food"
        android:id="@+id/txtFood"
        android:layout_below="@+id/prevExpense"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="53dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/etFood"
        android:layout_alignTop="@+id/txtFood"
        android:layout_alignLeft="@+id/prevExpense"
        android:layout_alignStart="@+id/prevExpense"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Shopping"
        android:id="@+id/txtShopping"
        android:layout_below="@+id/etFood"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="33dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/etShopping"
        android:layout_alignTop="@+id/txtShopping"
        android:layout_alignLeft="@+id/etFood"
        android:layout_alignStart="@+id/etFood"
        android:layout_alignRight="@+id/etFood"
        android:layout_alignEnd="@+id/etFood" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Fuel"
        android:id="@+id/txtFuel"
        android:layout_below="@+id/etShopping"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="31dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/etFuel"
        android:layout_alignTop="@+id/txtFuel"
        android:layout_alignLeft="@+id/etShopping"
        android:layout_alignStart="@+id/etShopping"
        android:layout_alignRight="@+id/etShopping"
        android:layout_alignEnd="@+id/etShopping" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Telephone"
        android:id="@+id/txtPhone"
        android:layout_below="@+id/etFuel"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="31dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/etTelephone"
        android:layout_alignTop="@+id/txtPhone"
        android:layout_alignLeft="@+id/etFuel"
        android:layout_alignStart="@+id/etFuel"
        android:layout_alignRight="@+id/etFuel"
        android:layout_alignEnd="@+id/etFuel" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Calculate"
        android:id="@+id/btnCalculate"
        android:layout_below="@+id/etTelephone"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="31dp" />
</RelativeLayout>