A 10-year decreasing annuity-immediate, with annual payments of 10, 9, 8, ..., 1, and the first payment is made one year from now. A perpetuity-immediate with annual payments. The perpetuity pays 1 in year 1, 2 in year 2, 3 in year 3, ..., and 11 in year 11. After year 11, the payments remain constant at X. At an effective annual interest rate of 10%, the present value today of Annuity 2 is twice the present value today of Annuity 1. Calculate X