$500 invested at an annual interest rate of 8 percent will be worth how much at the end of one year? group of answer choices $580. 15. $800 invested at an annually compounded interest rate of 6 percent will be worth how much at the end of 10 years? a. $1,280. *b. $1,433. c. $1,417. d. $1,369. $504. $508. $540.