b$)$ A life office issues a policy to a life aged exactly $50.$ The contract is a $15-$year

endowment assurance policy with a sum assured of Ksh $4,500,000$ payable on

maturity or at the end of the year of earlier death. Level premiums are payable

monthly in advance. Calculate the monthly premium assuming AM$92$

Ultimate mortality and $4\%$ pa interest. Ignore expenses.