What interest rate must Bertha earn on her savings if she plans to make equal semiannual savings payments of $11,384 at the end of each 6-month period starting in 6-months and ending in 12 years? She wants to have $371,647 at the end of 12 years.

Answer Format: INCLUDE ONLY NUMBERS AND DECIMALS IN YOUR ANSWER. Do not include "$" "," or any other formatting. Carry interim computations to at least 4 decimals. Enter percentage answers as a positive percentage % rounded to 2 decimal places. For example 0.123456 should be enter as: 12.35 (##.##)