Assume that at the beginning of the year, you purchase an investment for $9,100 that pays $79 annual income. Also assume that the investment's value has increased to $9,400 at the end of the year. (a) What is the rate of return for this investment? (Enter your answer as a percent rounded to 2 decimal places.) Rate of return % (b) is the rate of return a positive or negative number? O Positive O Negative