From the following particulars, calculate new profit-sharing ratio of the partners:

a Shiv, Mohan and Hari were partners in a firm sharing profits in the ratio of 5 : 5 : 4. Mohan retired and his share was divided equally between Shiv and Hari.

b P, Q and R were partners sharing profits in the ratio of 5 : 4 : 1. P retires from the firm.