From cac776a287260d38e7466913c2afd3318bc43d73 Mon Sep 17 00:00:00 2001
From: Nikollai <nikolai.lydvo@gmail.com>
Date: Wed, 4 Mar 2026 12:22:34 +0100
Subject: [PATCH] Filled out remaining functionality in SaleCalculator

---
 .../calculators/SaleCalculator.java           | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/main/java/temppackage/calculators/SaleCalculator.java b/src/main/java/temppackage/calculators/SaleCalculator.java
index 7a29444..af66c97 100644
--- a/src/main/java/temppackage/calculators/SaleCalculator.java
+++ b/src/main/java/temppackage/calculators/SaleCalculator.java
@@ -1,9 +1,11 @@
 package temppackage.calculators;
 
 import java.math.BigDecimal;
+import java.math.RoundingMode;
+
 import temppackage.Share;
 
-public class SaleCalculator {
+public class SaleCalculator implements TransactionCalculator{
   BigDecimal purchasePrice;
   BigDecimal salesPrice;
   BigDecimal quantity;
@@ -11,4 +13,25 @@ public SaleCalculator(Share share) {
     super();
     this.purchasePrice = share.getPurchasePrice();
   }
+  @Override
+  public BigDecimal calculateGross() {
+    return salesPrice.multiply(quantity);
+  }
+
+  @Override
+  public BigDecimal calculateComission() {
+    return this.calculateGross().divide(new BigDecimal("100"), RoundingMode.HALF_UP);
+  }
+
+  @Override
+  public BigDecimal calculateTax() {
+    BigDecimal purchaseCosts = this.purchasePrice.multiply(this.quantity);
+    BigDecimal earnings = this.calculateGross().subtract(this.calculateComission()).subtract(purchaseCosts);
+    return earnings.multiply(new BigDecimal("30")).divide(new BigDecimal("100"), RoundingMode.HALF_UP);
+  }
+
+  @Override
+  public BigDecimal calculateTotal() {
+    return this.calculateGross().subtract(this.calculateComission()).subtract(this.calculateTax());
+  }
 }