diff --git a/src/main/java/temppackage/calculators/PurchaseCalculator.java b/src/main/java/temppackage/calculators/PurchaseCalculator.java
index d80aa8f..4f7a3f1 100644
--- a/src/main/java/temppackage/calculators/PurchaseCalculator.java
+++ b/src/main/java/temppackage/calculators/PurchaseCalculator.java
@@ -19,7 +19,7 @@ public BigDecimal calculateGross() {
   }
 
   @Override
-  public BigDecimal calculateComission() {
+  public BigDecimal calculateCommission() {
     return this.calculateGross().multiply(new BigDecimal("0.05"));
   }
 
@@ -30,6 +30,6 @@ public BigDecimal calculateTax() {
 
   @Override
   public BigDecimal calculateTotal() {
-    return this.calculateGross().add(this.calculateTax().add(this.calculateComission()));
+    return this.calculateGross().add(this.calculateTax().add(this.calculateCommission()));
   }
 }
diff --git a/src/main/java/temppackage/calculators/SaleCalculator.java b/src/main/java/temppackage/calculators/SaleCalculator.java
index 2e63ef4..7f9e2d5 100644
--- a/src/main/java/temppackage/calculators/SaleCalculator.java
+++ b/src/main/java/temppackage/calculators/SaleCalculator.java
@@ -20,7 +20,7 @@ public BigDecimal calculateGross() {
   }
 
   @Override
-  public BigDecimal calculateComission() {
+  public BigDecimal calculateCommission() {
     return this.calculateGross().divide(new BigDecimal("100"), RoundingMode.HALF_UP);
   }
 
@@ -28,7 +28,7 @@ public BigDecimal calculateComission() {
   public BigDecimal calculateTax() {
     BigDecimal purchaseCosts = this.purchasePrice.multiply(this.quantity);
     BigDecimal earnings =
-        this.calculateGross().subtract(this.calculateComission()).subtract(purchaseCosts);
+        this.calculateGross().subtract(this.calculateCommission()).subtract(purchaseCosts);
     return earnings
         .multiply(new BigDecimal("30"))
         .divide(new BigDecimal("100"), RoundingMode.HALF_UP);
@@ -36,6 +36,6 @@ public BigDecimal calculateTax() {
 
   @Override
   public BigDecimal calculateTotal() {
-    return this.calculateGross().subtract(this.calculateComission()).subtract(this.calculateTax());
+    return this.calculateGross().subtract(this.calculateCommission()).subtract(this.calculateTax());
   }
 }
diff --git a/src/main/java/temppackage/calculators/TransactionCalculator.java b/src/main/java/temppackage/calculators/TransactionCalculator.java
index 78699bc..687fb9d 100644
--- a/src/main/java/temppackage/calculators/TransactionCalculator.java
+++ b/src/main/java/temppackage/calculators/TransactionCalculator.java
@@ -5,7 +5,7 @@
 public interface TransactionCalculator {
   public BigDecimal calculateGross();
 
-  public BigDecimal calculateComission();
+  public BigDecimal calculateCommission();
 
   public BigDecimal calculateTax();