diff --git a/src/main/java/Portfolio.java b/src/main/java/temppackage/Portfolio.java
similarity index 95%
rename from src/main/java/Portfolio.java
rename to src/main/java/temppackage/Portfolio.java
index 767012c..adc4af0 100644
--- a/src/main/java/Portfolio.java
+++ b/src/main/java/temppackage/Portfolio.java
@@ -1,3 +1,5 @@
+package temppackage;
+
 import java.util.ArrayList;
 import java.util.List;
 
diff --git a/src/main/java/Share.java b/src/main/java/temppackage/Share.java
similarity index 95%
rename from src/main/java/Share.java
rename to src/main/java/temppackage/Share.java
index 05c2feb..8055c3f 100644
--- a/src/main/java/Share.java
+++ b/src/main/java/temppackage/Share.java
@@ -1,3 +1,5 @@
+package temppackage;
+
 import java.math.BigDecimal;
 
 public class Share {
diff --git a/src/main/java/Stock.java b/src/main/java/temppackage/Stock.java
similarity index 96%
rename from src/main/java/Stock.java
rename to src/main/java/temppackage/Stock.java
index 39c591e..dfa2c23 100644
--- a/src/main/java/Stock.java
+++ b/src/main/java/temppackage/Stock.java
@@ -1,3 +1,5 @@
+package temppackage;
+
 import java.math.BigDecimal;
 import java.util.List;
 
diff --git a/src/main/java/temppackage/calculators/PurchaseCalculator.java b/src/main/java/temppackage/calculators/PurchaseCalculator.java
new file mode 100644
index 0000000..9f6dc06
--- /dev/null
+++ b/src/main/java/temppackage/calculators/PurchaseCalculator.java
@@ -0,0 +1,31 @@
+package temppackage.calculators;
+
+import temppackage.Share;
+
+import java.math.BigDecimal;
+
+public class PurchaseCalculator implements TransactionCalculator {
+  BigDecimal purchasePrice;
+  BigDecimal quantity;
+  public PurchaseCalculator(Share share) {
+    super();
+    this.purchasePrice = share.getPurchasePrice();
+    this.quantity = share.getQuantity();
+  }
+  @Override
+  public BigDecimal calculateGross() {
+    return this.purchasePrice.multiply(this.quantity);
+  }
+  @Override
+  public BigDecimal calculateComission() {
+    return this.calculateGross().multiply(new BigDecimal("0.05"));
+  }
+  @Override
+  public BigDecimal calculateTax() {
+    return new BigDecimal("0");
+  }
+  @Override
+  public BigDecimal calculateTotal() {
+    return this.calculateGross().add(this.calculateTax().add(this.calculateComission())) ;
+  }
+}
diff --git a/src/main/java/temppackage/calculators/SaleCalculator.java b/src/main/java/temppackage/calculators/SaleCalculator.java
new file mode 100644
index 0000000..7a29444
--- /dev/null
+++ b/src/main/java/temppackage/calculators/SaleCalculator.java
@@ -0,0 +1,14 @@
+package temppackage.calculators;
+
+import java.math.BigDecimal;
+import temppackage.Share;
+
+public class SaleCalculator {
+  BigDecimal purchasePrice;
+  BigDecimal salesPrice;
+  BigDecimal quantity;
+  public SaleCalculator(Share share) {
+    super();
+    this.purchasePrice = share.getPurchasePrice();
+  }
+}
diff --git a/src/main/java/calculators/TransactionCalculator.java b/src/main/java/temppackage/calculators/TransactionCalculator.java
similarity index 87%
rename from src/main/java/calculators/TransactionCalculator.java
rename to src/main/java/temppackage/calculators/TransactionCalculator.java
index 741c56a..de2e179 100644
--- a/src/main/java/calculators/TransactionCalculator.java
+++ b/src/main/java/temppackage/calculators/TransactionCalculator.java
@@ -1,4 +1,4 @@
-package calculators;
+package temppackage.calculators;
 
 import java.math.BigDecimal;