Create roi_calculator.py

roi_calculator.py

@@ -0,0 +1,12 @@
+def calculate_roi(customer_usage, current_model, recommended_model):
+    annual_savings = (current_model.cost - recommended_model.cost) * customer_usage * 365
+    return {
+        'annual_savings': f'${annual_savings:,}',
+        'payback_period': 'Immediate',
+        'monthly_savings': f'${annual_savings/12:,}'
+    }
+
+class Model:
+    def __init__(self, name, cost):
+        self.name = name
+        self.cost = cost