diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..10f4d43
Binary files /dev/null and b/.DS_Store differ
diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..e1b22ae 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -4,6 +4,18 @@
 # The least significant bit is at index 7.
 # Calculate  and return the decimal value for this binary number using
 # the algorithm you devised in class.
+binary_array = []
+8.times do
+  binary_array << rand(0..1)
+end
+
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  # raise NotImplementedError
+  n =  binary_array.length - 1
+  decimal_number = 0
+  binary_array.length.times do |i|
+    decimal_number += binary_array[i] * 2 ** n
+    n -= 1
+  end
+  return decimal_number
 end