Roland's normal retirement benefit is a life annuity of 1000 per month, beginning at age 65. Alternatively, he decides to select an equivalent benefit paying X per month beginning at age 70, with the first 5 years guaranteed. Find X given that / = .06, 4o6 ^ '^•^'^^' ^65 = 500, A^65 = 4950, D^o = 365, D^s = 200 and 7^75 = 1580.