diff --git a/EngieApi/DistributionCosts.py b/EngieApi/DistributionCosts.py
index 43d362b..3d6e4cd 100644
--- a/EngieApi/DistributionCosts.py
+++ b/EngieApi/DistributionCosts.py
@@ -1,3 +1,6 @@
+from typing import Tuple
+
+
 class Capaciteitstarief:
     def __init__(self):
         self.gemiddelde_maandpiek = 38.7570  # Eur / KW / jaar
@@ -15,9 +18,13 @@ class Capaciteitstarief:
         :type days: int
         """
         peak = max(peak, 2.5)
-        return ((peak * self.gemiddelde_maandpiek) / 365 * days + usage * self.kwh_tarief + self.databeheer / 365 * days) * self.btw
+        return (
+            (peak * self.gemiddelde_maandpiek) / 365 * days
+            + usage * self.kwh_tarief
+            + self.databeheer / 365 * days
+        ) * self.btw
 
-    def calculate_per_kwh(self, peak: float) -> tuple(float, float):
+    def calculate_per_kwh(self, peak: float) -> Tuple[float, float]:
         """calculate_per_kwh distribution cost
 
         :param peak: gemiddelde peak over alle maanden
@@ -25,4 +32,3 @@ class Capaciteitstarief:
         :return: cost per kwh and yearly costs
         """
         return self.kwh_tarief, self.databeheer + self.gemiddelde_maandpiek * peak
-    
\ No newline at end of file