The solution is:

           Variable           Value

          SPROB( A)       0.4750000

          SPROB( B)       0.1525000

          SPROB( C)       0.1675000

          SPROB( D)       0.2050000

Solution: MARKOV

So, we see the long run share of our new brand A will only amount to about 47.5% of the market, considerably less than the conjectured share of 75%.