In order to solve this, we have to use the formula of the future value of an annuity with compounded interest given by the following expression:
Where P is the periodic payment, r is the rate of interest. n is the number of times the interest is compound a year and t the year, by replacing 310 for P, 0.07(7%) for r, 4 for n, and 26 for t, we get:
Then, the total value of the annuity in 26 years will be $89908.22