diff --git a/Interface/Interface.csproj b/Interface/Interface.csproj
new file mode 100644
index 00000000..23df6047
--- /dev/null
+++ b/Interface/Interface.csproj
@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>
diff --git a/Interface/Program.cs b/Interface/Program.cs
new file mode 100644
index 00000000..720f09b9
--- /dev/null
+++ b/Interface/Program.cs
@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+ namespace Practice {
+     class Program {
+        public static void Main(String[] args){
+            Console.WriteLine("Interfaces Practice");
+             Car mercedes = new Car("AKJLGA", 140.67);
+            Vehicle lamborghini = new Car("OTISLGS", 1000);
+            Car fiesta = new Car("GSGIOJH", 30);
+            
+            HotelRoom suite = new HotelRoom("1001", 650);
+            HotelRoom standard1 = new HotelRoom("2001", 65);
+            HotelRoom standard2 = new HotelRoom("2002", 65);
+             List<Rentable> rentablThings = new List<Rentable>();
+            rentablThings.Add(mercedes);
+            rentablThings.Add(lamborghini);
+            rentablThings.Add(fiesta);
+            rentablThings.Add(suite);
+            rentablThings.Add(standard1);
+            rentablThings.Add(standard2);
+             
+            Console.WriteLine("James' way");
+            // james' way
+            foreach(Rentable thing in rentablThings) {
+                Console.WriteLine("if you rent this {0} for 1 day, the ammount due is {1}", 
+                thing.GetType().Name,
+                thing.calculateRent(1));
+            }
+            Console.WriteLine("\n\n");
+            Console.WriteLine("Robert's way");
+            // robert's way
+            foreach(Rentable thing in rentablThings) {
+                String thingType = "";
+                if(thing is Car){
+                    thingType = "car";
+                } else if (thing is HotelRoom){
+                    thingType = "hotel room";
+                }
+                 Console.WriteLine("if you rent this {0} for 1 day, the ammount due is {1}", 
+                thingType,
+                thing.calculateRent(1));
+            }
+             Console.WriteLine("\n\n");
+            Console.WriteLine("Lisa's way");
+            // Lisa's' way
+            foreach(Rentable thing in rentablThings) {
+                Console.WriteLine("if you rent this {0} for 1 day, the ammount due is {1}", 
+                thing.getType(),
+                thing.calculateRent(1));
+            }
+         }        
+    }
+     // 1. implement a Car class with an hourly rent rate attribute
+    // 2. implement a HotelRoom class with a nightly rent rate attribute
+    // 3. implement a calculateRent method that takes in number of days to rent, and return the amount due
+     public interface Rentable {
+         //double getDailyRate();
+        String getType();
+        double calculateRent(double daysToRent);
+    }
+     public abstract class Vehicle: Rentable {
+        public abstract double calculateRent(double daysToRent);
+        public virtual String getType(){
+            return "Vehicle";
+        }
+     }
+     public class Car : Vehicle{
+        public String licenseNo {get; private set;}
+        public double hourlyRate {get; private set;}
+         public Car(String licenseNo, double rate) {
+            this.licenseNo = licenseNo;
+            this.hourlyRate = rate;
+        }
+         public override String getType(){
+            return "Car";
+        }
+         /**
+         * Returns the amount due to rent this car for the number of days passed in
+         * daysToRent: the number of days to rent this car
+         */
+        public override double calculateRent(double daysToRent){
+            double dailyRate =  24*hourlyRate;
+            return dailyRate * daysToRent;
+        }
+    }
+     public class HotelRoom :Rentable{
+        public String roomNo {get; private set;}
+        public double dailyRate {get; private set;}
+         public HotelRoom(String roomNumber, double rate){
+            this.dailyRate = rate;
+            this.roomNo = roomNumber;
+        }
+         public String getType(){
+            return "Hotel Room";
+        }
+         /**
+         * Returns the amount due to rent this room for the number of days passed in
+         * daysToRent: the number of days to rent this room
+         */
+         public double calculateRent(double daysToRent){
+            return dailyRate * daysToRent;
+        }
+        
+    }
+}