<prompt> Translate the following text to EnglishIngawa Social Security hutoa msingi wa mapato ya kustaafu, faida za Social Security zinabadilisha tu asilimia 40 ya mapato ya kabla ya kustaafu kwa mfanyakazi wa kawaida.  <response>: While Social Security provides a foundation for retirement income, Social Security benefits replace only about 40 percent of pre-retirement income for the average worker. 