fix typo

src/overhaul_activity/service.py

@@ -142,12 +142,15 @@ async def get_standard_scope_by_session_id(*, db_session: DbSession, overhaul_se
     )
 
     data = await db_session.execute(query)
+    eqs = data.scalars().all()
+
+    material_cost = get_material_cost("B", len(eqs))
     results = []
 
-    for equipment in data.scalars().all():
+    for equipment in eqs:
         res = OverhaulActivityRead(
             id=equipment.id,
-            material_cost=35000000000,
+            material_cost=material_cost/10,
             service_cost=200000000,
             location_tag=equipment.location_tag,
             equipment_name=equipment.master_equipment.name if equipment.master_equipment else None,