diff --git a/solution.py b/solution.py
new file mode 100644
index 0000000..9845d1f
--- /dev/null
+++ b/solution.py
@@ -0,0 +1,21 @@
+f = open("test.csv", "r")
+
+ls = f.read().splitlines()
+final = ls[8].split(",")[2]
+
+sum = 0
+flows = 0
+
+for i in ls[1:-1]:
+    total = i.split(",")[2]
+    cash = i.split(",")[1]
+    if "." in cash:
+        cash = cash[:-3]
+    flows += int(cash)
+    yr = i.split(",")[0]
+    w = (7 - int(yr))/7
+    sum += w * int(cash)
+
+result = (float(final) - float(flows))/sum
+
+print(result)
\ No newline at end of file