Complete Code

README.md

@@ -62,9 +62,9 @@ A `LeaseContract` is created by passing the following attributes:
 
 The `total_value()` of a `LeaseContract` will be computed in this way: `vehicle.sale_price() + (lease_multiplier) - (discount if employee) * `. In this case `lease_multiplier` depends on the vehicle and is computed in the following way:
 
-* `Car`: `sale_price() + (sale_price() * 1.2 / length_in_months)`.
-* `Motorcycle`: `sale_price() + (sale_price() * 1 / length_in_months)`
-* `Truck`: `sale_price() + (sale_price() * 1.7 / length_in_months)`
+* `Car`: `sale_price() * 1.2 / length_in_months`.
+* `Motorcycle`: `sale_price() * 1 / length_in_months`
+* `Truck`: `sale_price() * 1.7 / length_in_months`
 
 The `monthly_value` of the contract will be just the total value divided by the amount of months: `total_value() / length_in_months`.
 
@@ -104,4 +104,4 @@ Given a Car with `sale_price()` $15,000, a regular customer (not employee) and 1
 Given a Truck with `sale_price()` $35,000, a regular customer (not employee) and 36 `length_in_months`:
 
 * `total_value()`: `sale_price() + (sale_price() * 1.7 / length_in_months)` = `$35,000 + (35,000 * 1.7 / 36)` = `$36,652.77`
-* `monthly_value()`: `total_value() / monthly_payments` = `$36,652.78 / 36` = `$1,018.13`
+* `monthly_value()`: `total_value() / monthly_payments` = `$36,652.78 / 36` = `$1,018.13`

dealership/contracts.py

@@ -1,12 +1,38 @@
-class Contract(object):
-    pass
+from dealership.customers import Customer, Employee
+from dealership.vehicles import Car, Motorcycle, Truck
 
+class Contract(object):
+  def __init__(self , vehicle, customer):
+    self.vehicle = vehicle
+    self.customer = customer
 
 class BuyContract(Contract):
     def __init__(self, vehicle, customer, monthly_payments):
-        pass
-
+        super(BuyContract, self).__init__(vehicle, customer)
+        self.monthly_payments = monthly_payments
+
+    def total_value(self):
+        discount = 0
+        if(self.customer.is_employee()):
+            discount = self.customer.DISCOUNT
+        total = self.vehicle.sale_price() + (self.vehicle.INTREST_RATE * self.monthly_payments * self.vehicle.sale_price()/100)
+        return total - (total * discount)
+
+    def monthly_value(self):
+        return self.total_value() / self.monthly_payments
 
 class LeaseContract(Contract):
     def __init__(self, vehicle, customer, length_in_months):
-        pass
+        super(LeaseContract, self).__init__(vehicle, customer)
+        self.length_in_months = length_in_months
+
+    def total_value(self):
+      discount = 0
+      if(self.customer.is_employee()):
+         discount = self.customer.DISCOUNT
+      total = self.vehicle.sale_price() + (self.vehicle.sale_price() * self.vehicle.LEASE_MUTIPLIER / self.length_in_months)
+
+      return total - ( total * discount)
+
+    def monthly_value(self):
+      return self.total_value() / self.length_in_months

dealership/customers.py

@@ -1,11 +1,18 @@
 class Person(object):
-    def __init__(self, first_name, last_name, email):
-        pass
-
+   def __init__(self, first_name, last_name, email):
+      self.first_name = first_name
+      self.last_name = last_name
+      self.email = email
+
 
 class Customer(Person):
-    pass
+
+  def is_employee(self):
+    return False
 
 
 class Employee(Person):
-    pass
+  DISCOUNT = 0.10
+
+  def is_employee(self):
+     return True

dealership/vehicles.py

@@ -1,15 +1,33 @@
 class Vehicle(object):
     def __init__(self, maker, model, year, base_price, miles):
-        pass
-
-
+        self.maker = maker
+        self.model = model
+        self.year = year
+        self.base_price = base_price
+        self.miles = miles
+
+    def sale_price(self):
+       return (self.base_price * self.SALE_PRICE_MULTIPLIER)
+
+    def purchase_price(self):
+       return (self.sale_price() - (self.PURCHASE_PRICE_MULTIPLIER * self.miles))
+
 class Car(Vehicle):
-    pass
-
+      SALE_PRICE_MULTIPLIER = 1.2
+      PURCHASE_PRICE_MULTIPLIER = 0.004
+      INTREST_RATE = 1.07
+      LEASE_MUTIPLIER = 1.2
 
 class Motorcycle(Vehicle):
-    pass
-
+      SALE_PRICE_MULTIPLIER = 1.1
+      PURCHASE_PRICE_MULTIPLIER = 0.009
+      INTREST_RATE = 1.03
+      LEASE_MUTIPLIER = 1
 
 class Truck(Vehicle):
-    pass
+      SALE_PRICE_MULTIPLIER = 1.6
+      PURCHASE_PRICE_MULTIPLIER = 0.02
+      INTREST_RATE = 1.11
+      LEASE_MUTIPLIER = 1.7
+
+