Take the downpayment as a number from 0-1

__init__.py

@@ -69,7 +69,13 @@ def get_risk_pool_health() -> float:
 def compute_mre(home_value: float,
                 down_payment: float,
                 consumer_fico: int) -> float:
+    if down_payment < 0 or down_payment > 1:
+        raise ValueError('The down_payment must be between 0 and 1')
 
+    if consumer_fico < 620 or consumer_fico > 850:
+        raise ValueError('The consumer_fico must between 620 and 850')
+        
+    down_payment *= home_value
     investor_value = home_value - down_payment
     loan_to_value = float(investor_value/home_value)
     # the monthly payment is made on the value from the investors