By selling an article at 6/8 of the marked price, there is a gain of…

SP = \(\frac{6}{8}\) MP

⇒ SP = \(\frac{3}{4}\) MP ⇒ SP : MP = 3 : 4

Thus, there was a discount of 25% on MP                                             

and gain = 25% (given)

Therefore, 

             MRP.        :           CP

    (100 + Profit)    :      (100 - discount)

             125         :           75

               5           :           3