diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..7810983 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -4,6 +4,16 @@
 # 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.
+
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  multiplier = 1
+  converted_number = 0
+  i = 1
+  binary_array.length.times do |number|
+    converted_number += binary_array[binary_array.length - i] * multiplier
+    i += 1
+    multiplier *= 2
+  end
+  return converted_number
 end
+