Add new file

DiscountPercent.java

+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+import java.util.Random;
+
+public class DiscountPercent extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_discount_percent);
+
+        final Random myRandom = new Random();
+
+        Button buttonGenerate = (Button)findViewById(R.id.generate);
+        final TextView textGenerateNumber = (TextView)findViewById(R.id.generatenumber);
+
+        buttonGenerate.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                textGenerateNumber.setText(String.valueOf(myRandom.nextInt(50)));
+            }
+        });
+
+
+    Button mButton = (Button) findViewById(R.id.button5);
+        mButton.setOnClickListener(new View.OnClickListener() {
+@Override
+public void onClick(View view) {
+        startActivity(new Intent(DiscountPercent.this, CountdownTimer.class));
+        }
+        });
+        }
+        }
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