Rahul sold a box for ₹1,440 at a loss of 40%. What should the selling price of the box be to enable Rahul to earn a profit of 40%?

₹3,360

        SP₁                    SP₂

      100 - D%           100 + P%

     100 - 40%           100 + 40%

         60                      140

        ⇓×24                    ⇓×24

     1,440 Given         ₹3,360