From cca567e4c0e185ae16c78ec42ba8f7864ab8da61 Mon Sep 17 00:00:00 2001
From: Solveig Natvig <solveig.natvig@gmail.com>
Date: Wed, 25 Feb 2026 07:35:46 +0100
Subject: [PATCH] Add PurchaseCalculator

---
 src/main/java/PurchaseCalculator.java | 29 +++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/main/java/PurchaseCalculator.java

diff --git a/src/main/java/PurchaseCalculator.java b/src/main/java/PurchaseCalculator.java
new file mode 100644
index 0000000..0ca34cb
--- /dev/null
+++ b/src/main/java/PurchaseCalculator.java
@@ -0,0 +1,29 @@
+import java.math.BigDecimal;
+
+public class PurchaseCalculator {
+    private BigDecimal purchasePrice;
+    private BigDecimal quantity;
+    
+    public PurchaseCalculator(Share share) {
+        this.purchasePrice = share.getPurchasePrice();
+        this.quantity = share.getQuantity();
+    }
+
+    public BigDecimal calculateGross() {
+        return this.purchasePrice.multiply(this.quantity);
+    }
+
+    public BigDecimal calculateCommission() {
+        BigDecimal rate = new BigDecimal("0.005");
+        return calculateGross().multiply(rate);
+    }
+
+    public BigDecimal calculateTax() {
+        BigDecimal tax = new BigDecimal("0");
+        return tax;
+    }
+
+    public BigDecimal calculateTotal() {
+        return calculateGross().add(calculateCommission()).add(calculateTax());
+    }
+}