HackerRank - Ruby - 30 days of code: added days 10 and 11

Author: rodrigorosa

Diff for: hackerrank/ruby/30_days_of_code/day12_inheritance.rb

@@ -0,0 +1,24 @@
+class Student <Person
+  def initialize(firstName, lastName, id, scores)
+    super(firstName, lastName, id)
+    @scores = scores
+  end
+
+  def calculate
+    avg = @scores.sum / @scores.size
+    case avg
+      when 90..100
+        'O'
+      when 80..89
+        'E'
+      when 70..79
+        'A'
+      when 55..69
+        'P'
+      when 40..54
+        'D'
+      when 0..39
+        'T'
+    end
+  end
+end

Diff for: hackerrank/ruby/30_days_of_code/day13_abstract_classes.rb

@@ -0,0 +1,11 @@
+def initialize(title, author, price)
+  @title = title
+  @author = author
+  @price = price
+end
+
+def display
+  puts "Title: #{@title}"
+  puts "Author: #{@author}"
+  puts "Price: #{@price}"
+end