diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..336816a 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -5,5 +5,31 @@
 # 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
+  binary_calculation = 0
+  if binary_array[7] == 1
+    binary_calculation = 1
+  end
+  if binary_array[6] == 1
+    binary_calculation += (1 * 2 ** 1)
+  end
+  if binary_array[5] == 1
+    binary_calculation += (1 * 2 ** 2)
+  end
+  if binary_array[4] == 1
+    binary_calculation += (1 * 2 ** 3)
+  end
+  if binary_array[3] == 1
+    binary_calculation += (1 * 2 ** 4)
+  end
+  if binary_array[2] == 1
+    binary_calculation += (1 * 2 ** 5)
+  end
+  if binary_array[1] == 1
+    binary_calculation += (1 * 2 ** 6)
+  end
+  if binary_array[0] == 1
+    binary_calculation += (1 * 2 ** 7)
+  end
+
+  return binary_calculation
 end