diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..b111c08 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
+  total = 0
+  power = binary_array.length - 1
+  binary_array.each do |binary|
+    number = binary * 2**power
+    total += number
+    power -= 1
+  end 
+  return total
+  # raise NotImplementedError
 end
+