Your neighbor is asking you to invest in a venture that will double your money in 4 year(s). Compute the annual rate of return that he is promising

Your neighbor is asking you to invest in a venture that will double your money in 4 year(s). Compute the annual rate of return that he is promising you? (Record your answer as a percent rounded to 1 decimal place; for example, record .186982 = 18.7% as 18.7).

Please explain how you got the answer Thanks