A, B and C are partners in a firm sharing profits and losses in the ratio of 4 : 3 : 2. B decides to retire from the firm. Calculate new profit-sharing ratio of A and C in the following circumstances:

a If B gives his share to A and C in the original ratio of A and C. b If B gives his share to A and C in equal proportion.

c If B gives his share to A and C in the ratio of 3 : 1.

d If B gives his share to A only.