We can solve this problem by using the formula for finding the present value given the annuity values. The formula is given as:
P = A * [(1 + i)^n – 1] / i (1 + i)^n
Where,
P = present value of the annuity
A = the annuity value = $26,000
i = interest rate = 0.06
n = number of years = 90 – 65 = 25
Substituting the given values to the equation:
P = 26,000 * [(1 + 0.06)^25 – 1] / 0.06 (1 + 0.06)^25
P = 26,000 * 12.783356183
P = $332,367.26
Therefore the present value of his social security benefits will be about $332,367.26