When an article is sold at a discount of 40% on its marked price, the profit is 25%. What is the ratio of the cost price to the marked price of the article?

12 : 25

        CP                    MP

      100 - D%           100 + P%

     100 - 40%           100 + 25%

         60                      125

CP : MP = 60 : 125 = 12 : 25