diff --git a/src/main/java/millions/calculators/PurchaseCalculatorFactory.java b/src/main/java/millions/calculators/PurchaseCalculatorFactory.java
deleted file mode 100644
index 7f496cf..0000000
--- a/src/main/java/millions/calculators/PurchaseCalculatorFactory.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package millions.calculators;
-
-import millions.Share;
-
-public class PurchaseCalculatorFactory extends TransactionCalculatorFactory {
-  Share share;
-
-  @Override
-  public void setShare(Share share) {
-    this.share = share;
-  }
-
-  @Override
-  public TransactionCalculator createCalculator() {
-    return new PurchaseCalculator(share);
-  }
-
-}
diff --git a/src/main/java/millions/calculators/SaleCalculatorFactory.java b/src/main/java/millions/calculators/SaleCalculatorFactory.java
deleted file mode 100644
index fd16818..0000000
--- a/src/main/java/millions/calculators/SaleCalculatorFactory.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package millions.calculators;
-
-import millions.Share;
-
-public class SaleCalculatorFactory extends TransactionCalculatorFactory {
-  Share share;
-
-  @Override
-  public void setShare(Share share) {
-    this.share = share;
-  }
-  @Override
-  public TransactionCalculator createCalculator() {
-    return new SaleCalculator(share);
-  }
-}
diff --git a/src/main/java/millions/calculators/TransactionCalculatorFactory.java b/src/main/java/millions/calculators/TransactionCalculatorFactory.java
index 106ca73..dd79b39 100644
--- a/src/main/java/millions/calculators/TransactionCalculatorFactory.java
+++ b/src/main/java/millions/calculators/TransactionCalculatorFactory.java
@@ -2,7 +2,15 @@
 
 import millions.Share;
 
-public abstract class TransactionCalculatorFactory {
-  public abstract void setShare(Share share);
-  public abstract TransactionCalculator createCalculator();
+public class TransactionCalculatorFactory {
+
+  private TransactionCalculatorFactory() {}
+
+  public TransactionCalculator createPurchaseCalculator(Share share) {
+    return new PurchaseCalculator(share);
+  }
+
+  public TransactionCalculator createSaleCalculator(Share share) {
+    return new SaleCalculator(share);
+  }
 }