You are considering an annuity which costs $100,483 today. The annuity pays $7,300 a year at an annual interest rate of 6.0 percent. What is the length of the annuity time period? You are considering an annuity which costs $100,483 today. The annuity pays $7,300 a year at an annual interest rate of 6.0 percent. What is the length of the annuity time period?