You are considering an annuity which costs $127,392 today. The annuity pays $7,700 a year at an annual interest rate of 4.5 percent. What is the length of the annuity time period? 29.90 years 32.00 years 36.35 years 25.55 years 31.00 years How do i do this? I keep entering it into my calculator and don't think it's getting me the correct answer