diff --git a/ride-share.rb b/ride-share.rb
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+########################################################
+# Step 1: Establish the layers
+
+# In this section of the file, as a series of comments,
+# create a list of the layers you identify.
+# Which layers are nested in each other?
+# Which layers of data "have" within it a different layer?
+# Which layers are "next" to each other?
+
+# Top Layer: Data for all Drivers
+# Second Layer: Each individual Driver
+# Third Layer: Each of the Driver's Trips
+# Fourth Layer: Data on each individual trip: Date, Cost, Rider ID, Rating
+
+
+########################################################
+# Step 2: Assign a data structure to each layer
+
+# Top Layer: Data for all Drivers - Hashes - Multiple key:value pairs, one for each driver
+# Second Layer: Each individual Driver - A single hash. Key is the driver, value is an array containing a list of the driver's trips
+# Third Layer: Each of the Driver's Trips - An entry in said array, each in the form of a hash
+# Fourth Layer: Data on each individual trip: A hash containing: Date (String), Cost (Integer), Rider ID (String), Rating (Integer)
+
+########################################################
+# Step 3: Make the data structure!
+
+driver_data = {
+    DR0001: [
+        {
+            date: "3rd Feb 2016",
+            rider_id: "RD0003",
+            cost: 10,
+            rating: 3
+        },
+        {
+            date: "3rd Feb 2016",
+            rider_id: "RD0015",
+            cost: 30,
+            rating: 4
+        },
+        {
+            date: "5th Feb 2016",
+            rider_id: "RD0003",
+            cost: 45,
+            rating: 2
+        }
+    ],
+
+    DR0002: [
+        {
+            date: "3rd Feb 2016",
+            rider_id: "RD0073",
+            cost: 25,
+            rating: 5
+        },
+        {
+            date: "4th Feb 2016",
+            rider_id: "RD0013",
+            cost: 15,
+            rating: 1
+        },
+        {
+            date: "5th Feb 2016",
+            rider_id: "RD0066",
+            cost: 35,
+            rating: 3
+        }
+    ],
+
+    DR0003: [
+        {
+            date: "4th Feb 2016",
+            rider_id: "RD0066",
+            cost: 5,
+            rating: 5
+        },
+        {
+            date: "5th Feb 2016",
+            rider_id: "RD0003",
+            cost: 50,
+            rating: 2
+        }
+    ],
+
+    DR0004: [
+        {
+            date: "3rd Feb 2016",
+            rider_id: "RD0022",
+            cost: 5,
+            rating: 5
+        },
+        {
+            date: "4th Feb 2016",
+            rider_id: "RD0022",
+            cost: 10,
+            rating: 4
+        },
+        {
+            date: "5th Feb 2016",
+            rider_id: "RD0022",
+            cost: 10,
+            rating: 4
+        }
+    ]
+}
+
+
+########################################################
+# Step 4: Total Driver's Earnings and Number of Rides
+
+# 1. the number of rides each driver has given
+def total_rides(data)
+  ride_count = []
+
+  data.each do |driver, rides|
+    ride_count << rides.count
+  end
+
+  i = 0
+
+  return data.each do |driver, rides|
+    puts "Driver #{driver}: #{ride_count[i]} rides."
+    i += 1
+  end
+end
+
+puts "The number of rides each driver has given:"
+total_rides(driver_data)
+puts ""
+
+
+# 2. the total amount of money each driver has made
+def total_earnings(data)
+  driver_earnings = []
+
+  data.each do |driver, rides|
+    ride_earnings = []
+    rides.each do |ride|
+      ride_earnings << ride[:cost]
+    end
+    driver_earnings << ride_earnings.sum
+  end
+
+  i = 0
+  return data.each do |driver, rides|
+    puts "Driver #{driver}: $#{driver_earnings[i]}."
+    i += 1
+  end
+end
+
+puts "The total amount of money each driver has made:"
+total_earnings(driver_data)
+puts ""
+
+
+# 3. the average rating for each driver
+def average_rating(data)
+  driver_rating = []
+
+  data.each do |driver, rides|
+    ratings = []
+    rides.each do |ride|
+      ratings << ride[:rating]
+    end
+    driver_rating << ratings.sum.to_f / ratings.count
+  end
+
+  i = 0
+  return data.each do |driver, rides|
+    puts "Driver #{driver}: #{sprintf('%.2f', driver_rating[i])}"
+    i += 1
+  end
+end
+
+puts "The average rating for each driver:"
+average_rating(driver_data)
+puts ""
+
+
+# 4. Which driver made the most money?
+def most_money(data)
+  driver_earnings = []
+
+  data.each do |driver, rides|
+    ride_earnings = []
+    rides.each do |ride|
+      ride_earnings << ride[:cost]
+    end
+    driver_earnings << ride_earnings.sum
+  end
+
+  if driver_earnings == []
+    return nil
+  end
+
+  most_index = driver_earnings.index(driver_earnings.max)
+
+  return puts "Driver DR000#{most_index + 1} has the highest earnings with $#{driver_earnings[most_index]}."
+end
+
+most_money(driver_data)
+puts ""
+
+
+# 5.  Which driver has the highest average rating?
+def highest_rating(data)
+  driver_rating = []
+
+  data.each do |driver, rides|
+    ratings = []
+    rides.each do |ride|
+      ratings << ride[:rating]
+    end
+    driver_rating << ratings.sum.to_f / ratings.count
+  end
+
+  if driver_rating == []
+      return nil
+  end
+
+  highest_index = driver_rating.index(driver_rating.max)
+
+  return puts "Driver DR000#{highest_index + 1} has the highest average rating."
+end
+
+highest_rating(driver_data)