diff --git a/lib/binary_to_decimal.rb b/lib/binary_to_decimal.rb
index 439e8c6..55796ae 100644
--- a/lib/binary_to_decimal.rb
+++ b/lib/binary_to_decimal.rb
@@ -1,9 +1,25 @@
+require 'minitest/autorun'
+require 'minitest/reporters'
 # 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.
+
+
+#Creates randomly filled array with 0's and 1's, 8 times.
+binary_array = []
+8.times do
+  binary_array << rand(0..1)
+end
+
+#Create method named binary_to_decimal to return decimal value. input is binary array.
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  bit_num = binary_array.length
+  decimal_num = 0
+  bit_num.times do |index|
+    decimal_num += binary_array[(bit_num - index) - 1] * (2 ** index)
+  end
+  return decimal_num
 end