diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..a0fe7dc 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -5,5 +5,11 @@
 # 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
-end
+    decimal = 0
+    i = 0
+    while i < 8 do
+    decimal += binary_array[i] * (2 ** (7 - i))
+    i += 1
+   end 
+   return decimal 
+end