From 5ced40dbee68728df48fe7f5f1b43e2879a17c80 Mon Sep 17 00:00:00 2001
From: = <tohja001@gmail.com>
Date: Wed, 11 Feb 2026 18:57:16 +0100
Subject: [PATCH] Feat: Implemented TransactionCalculator interface

---
 .../g40/mappe/TransactionCalculator.java      | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/TransactionCalculator.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/TransactionCalculator.java
index e69de29..37619ac 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/TransactionCalculator.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/TransactionCalculator.java
@@ -0,0 +1,22 @@
+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+import java.math.BigDecimal;
+
+/**
+ * Interface implemented by various calculators.
+ *
+ * <p>Has methods for calculating gross, commission fee, tax and total</p>*/
+public interface TransactionCalculator {
+
+  /** Method for calculating gross transaction amount. */
+  BigDecimal calculateGross();
+
+  /** Method for calculating commission fee for transaction amount. */
+  BigDecimal calculateCommission();
+
+  /** Method for calculating tax fee for transaction amount. */
+  BigDecimal calculateTax();
+
+  /** Method for calculating total amount for transaction. */
+  BigDecimal calculateTotal();
+}