diff --git a/src/Calculation/DefaultCalculator.php b/src/Calculation/DefaultCalculator.php
index e554fb5..5b82850 100644
--- a/src/Calculation/DefaultCalculator.php
+++ b/src/Calculation/DefaultCalculator.php
@@ -4,10 +4,12 @@ namespace Gloudemans\Shoppingcart\Calculation;
 
 use Gloudemans\Shoppingcart\CartItem;
 
-class DefaultCalculator {
-    static function getAttribute(string $attribute, CartItem $cartItem) {
+class DefaultCalculator
+{
+    public static function getAttribute(string $attribute, CartItem $cartItem)
+    {
         $decimals = config('cart.format.decimals', 2);
-        
+
         switch ($attribute) {
             case 'discount':
                 return $cartItem->price * ($cartItem->getDiscountRate() / 100);
@@ -31,4 +33,4 @@ class DefaultCalculator {
                 return;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Calculation/GrossPrice.php b/src/Calculation/GrossPrice.php
index d622e12..1442599 100644
--- a/src/Calculation/GrossPrice.php
+++ b/src/Calculation/GrossPrice.php
@@ -4,10 +4,12 @@ namespace Gloudemans\Shoppingcart\Calculation;
 
 use Gloudemans\Shoppingcart\CartItem;
 
-class GrossPrice {
-    static function getAttribute(string $attribute, CartItem $cartItem) {
+class GrossPrice
+{
+    public static function getAttribute(string $attribute, CartItem $cartItem)
+    {
         $decimals = config('cart.format.decimals', 2);
-        
+
         switch ($attribute) {
             case 'priceNet':
                 return round($cartItem->price / (1 + ($cartItem->taxRate / 100)), $decimals);
@@ -33,4 +35,4 @@ class GrossPrice {
                 return;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/CartItem.php b/src/CartItem.php
index b73d203..dba9b8d 100644
--- a/src/CartItem.php
+++ b/src/CartItem.php
@@ -397,8 +397,8 @@ class CartItem implements Arrayable, Jsonable
             case 'weightTotal':
                 return round($this->weight * $this->qty, $decimals);
         }
-        
-        return call_user_func(config('cart.calculator', DefaultCalculator::class) . '::getAttribute', $attribute, $this);
+
+        return call_user_func(config('cart.calculator', DefaultCalculator::class).'::getAttribute', $attribute, $this);
     }
 
     /**
@@ -528,4 +528,4 @@ class CartItem implements Arrayable, Jsonable
     {
         return $this->discountRate;
     }
-}
\ No newline at end of file
+}