What is a simple formula for computing retirement?

A simple formula for computing your retirement salary is to average your best three years' salaries. Take this average and multiply it by the number of years you have worked in' public schools times 2.3%. For example, the average of 3 years' salaries of $30,000, $31,000, and $32,000 would be $31,000. A teacher who has taught for 30 years would get 69% of that amount (30 years multiplied by 2.3% equals 69%) or $2139 a month. For exact information, please call the Texas Teacher Retirement System at 1-800-223-8778 or 1-512-397-6400, or access the TRS web page.