Use the commission schedule from Company Principal (Value of Stock) Commission B shown in the table to find the annual rate of Under $3,000 $32 +1.8% of principal interest earned on the investment. (Note: commisions are rounded to the nearest cent.) $3,000 - $10,000 $56 +1% of principal Over $10,000 $106 +0.5% of principal An investor purchases 267 shares at $39.09 a share, holds the stock for 329 days, and then sells the stock for $43.59 a share. Assume a 360-day year. The annual rate of interest is %. (Round to three decimal places.)