diff --git a/src/main/java/temppackage/TransactionArchive.java b/src/main/java/temppackage/TransactionArchive.java
index 9888c8c..8b257b2 100644
--- a/src/main/java/temppackage/TransactionArchive.java
+++ b/src/main/java/temppackage/TransactionArchive.java
@@ -29,17 +29,20 @@ public List<Transaction> getTransactions(int week) {
   }
 
   public List<Purchase> getPurchases(int week) {
-    // TODO
-    return null;
+    return transactions.stream()
+        .filter(t -> t.getWeek() == week && t instanceof Purchase)
+        .map(t -> (Purchase) t)
+        .collect(Collectors.toList());
   }
 
   public List<Sale> getSales(int week) {
-    // TODO
-    return null;
+    return transactions.stream()
+        .filter(t -> t.getWeek() == week && t instanceof Sale)
+        .map(t -> (Sale) t)
+        .collect(Collectors.toList());
   }
 
   public int countDistinctWeeks() {
-    // TODO
-    return 0;
+    return (int) transactions.stream().map(Transaction::getWeek).distinct().count();
   }
 }