diff --git a/your_return_calculator.rb b/your_return_calculator.rb
index 3b43174..640a749 100644
--- a/your_return_calculator.rb
+++ b/your_return_calculator.rb
@@ -2,14 +2,25 @@
 
 class YourReturnCalculator < ReturnCalculator
   def calculate!
-    # Write your code here.
-    # You have access to the `snapshots` variable.
-    #
-    # You can access the following properties of a snapshot:
-    # snapshot.date
-    # snapshot.cash_flow
-    # snapshot.market_value
-
-    BigDecimal.new(0)
+
+    case snapshots.length
+    when 0 # Edge case: if there is only one day, return 0
+      0
+    else # Otherwise:
+
+      time_weighted_return = BigDecimal.new(1) # Better accuracy with floating point operations
+
+      prev_snapshot = snapshots[0].market_value # Set prev_snapshot
+
+      for snapshot in snapshots[1..-1] do # Loop starting from second day
+
+        unless prev_snapshot == 0 then # Skip days where the market value is 0
+          time_weighted_return *= (snapshot.market_value - snapshot.cash_flow)/prev_snapshot
+          prev_snapshot = snapshot.market_value
+        end
+      end
+
+      time_weighted_return - 1 # return the compounded return
+    end
   end
 end