Use the commission schedule from Company A shown in the table to find the annual rate of interest earned on the investment. (Note: commissions are rounded to the nearest cent.) Principal (Value of Stock) Under $3,000 $3,000 to $10,000 Over $10,000 An investor purchases 420 shares at $10.35 a share, holds the stock for 42 weeks, and then sells the stock for $18.85 a share. The annual rate is %. (Round to five decimal places.) C Commission $25 +1.8% of principal $37+ 1.4% of principal $107 +0.7% of principal