diff --git a/app/helpers/solver_helper.py b/app/helpers/solver_helper.py
index e754a42..1b1c613 100644
--- a/app/helpers/solver_helper.py
+++ b/app/helpers/solver_helper.py
@@ -12,7 +12,7 @@ from models.item import Item
 from lib.errors.item_generation_error import ItemGenerationError
 
 def build_constraints(solver_run: SolverRun, problem: LpProblem,
-                      items: list[Item], bundles: list[Bundle], selected_items, selected_bundles) -> LpProblem:
+                      items: list[Item], bundles: list[Bundle], selected_items: list[Item], selected_bundles: list[Bundle]) -> LpProblem:
     logging.info('Creating Constraints...')
 
     try:
diff --git a/app/models/solver_run.py b/app/models/solver_run.py
index a1a729b..ad54659 100644
--- a/app/models/solver_run.py
+++ b/app/models/solver_run.py
@@ -113,7 +113,7 @@ class SolverRun(BaseModel):
         else:
             return self.items
 
-    def select_items_by_percent(self, percent) -> list[Item]:
+    def select_items_by_percent(self, percent: int) -> list[Item]:
         items = self.unbundled_items()
         total_items = len(items)
         selected_items_amount = round(total_items - (total_items *
@@ -121,7 +121,7 @@ class SolverRun(BaseModel):
 
         return random.sample(items, selected_items_amount)
 
-    def select_bundles_by_percent(self, percent) -> list[Bundle]:
+    def select_bundles_by_percent(self, percent: int) -> list[Bundle]:
         total_bundles = len(self.bundles)
         selected_bundles_amount = round(total_bundles - (total_bundles *
                                                          (percent / 100)))