#Buy#Sell#Profit#Loss#Counter

 MainActivity.java

package com.rudrapintu12.profitpercentage;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    EditText edBuy, profitPercentage;
    Button buttonSell;
    TextView tvDisplay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        edBuy = findViewById(R.id.edBuy);
        profitPercentage = findViewById(R.id.profitPercentage);
        buttonSell = findViewById(R.id.buttonSell);
        tvDisplay = findViewById(R.id.tvDisplay);

        buttonSell.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                float byPrice, sellPrice, profit, Percentage;

                String sBuy = edBuy.getText().toString();
                byPrice = Float.parseFloat(sBuy);

                String profitPercent = profitPercentage.getText().toString();
                Percentage = Float.parseFloat(profitPercent);

               profit = byPrice*Percentage/100;
               sellPrice = profit+byPrice;


                tvDisplay.setText("আপনার বিক্রয়মূল্য হবে " +sellPrice+ " টাকা"+"\n এবং আপনার লাভ হবে " +profit+ "টাকা");
            }
        });


    }
}

Activity_Main.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:gravity="center_horizontal">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/BuySalesProfitLossCount"
        android:textSize="15sp"
        android:textColor="#433"
        android:gravity="center"/>

    <ImageView
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:src="@drawable/buy"
        android:contentDescription="@string/sell" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/buying_price"
        android:textSize="20sp"
        android:textColor="#578000"  />


    <EditText
        android:id="@+id/edBuy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:autofillHints=""
        android:hint="@string/buyingPrice"
        android:inputType="number"
        android:textColorHint="#78909C"
        android:textSize="25sp" />

    <ImageView
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:src="@drawable/profit"
        tools:ignore="ImageContrastCheck"
        android:contentDescription="@string/img" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/profit"
        android:textSize="20sp"
        android:textColor="#933"
        />

    <EditText
        android:id="@+id/profitPercentage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:autofillHints=""
        android:hint="@string/profitPercentage"
        android:inputType="number"
        android:textColorHint="#78909C"
        android:textSize="25sp" />

    <Button
        android:id="@+id/buttonSell"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/sell_price"
        android:textSize="20sp"
        android:textColor="#ffffff" />

    <TextView
        android:id="@+id/tvDisplay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textStyle="bold"
        android:textColor="#533"
        android:textSize="25sp"
        />
    <ImageView
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:src="@drawable/sell"
        android:contentDescription="@string/tv" />

</LinearLayout>