diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..ca68201
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..e6f0249 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -1,9 +1,13 @@
-# A method named `binary_to_decimal` that receives as input an array of size 8.
-# The array is randomly filled with 0’s and 1’s.
-# The most significant bit is at index 0.
-# 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
+    power = binary_array.length - 1
+    base_10 = 0
+  
+    binary_array.each do |i|
+      if i == 1
+        base_10 += 2 ** power
+      end
+      power -= 1
+    end
+    puts "#{binary_array} in base 10 is: #{base_10}"
+    return base_10
 end