this is actuarial work about whole life annuities

Question For a life aged 60, the force of mortality is constant, p = 0.04. The force of interest is constant, and the actuarial present value for a continuous whole life insurance of amount $1 at age 60 equals 0.45. Calculate the actuarial present value of a whole life annuity of $1 per year payable continuously at age 60. Possible Answers 11.05 B 11.25 11.50 12.15 E 12.50