fix type

fet2020/finance/forms.py

@@ -1,5 +1,6 @@
 from datetime import datetime
 from dateutil.relativedelta import relativedelta
+import decimal
 
 from django import forms
 from django.core.validators import ValidationError
@@ -638,9 +639,9 @@ class ResolutionAdminForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)  # to get the self.fields set
 
-        budget = 0.0
-        total = 0.0
-        if (resolution := kwargs.get("instance")) is not None:
+        budget = decimal.Decimal(0.0)
+        total = decimal.Decimal(0.0)
+        if resolution := kwargs.get("instance"):
             for elem in Bill.objects.filter(resolution=resolution):
                 total += elem.amount