Find the margin of error for a 90% confidence interval when the standard deviation is LaTeX: \sigma= 50=50 and LaTeX: n = 25=25. (Round to three decimal places.)

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?