Investment - Total Rate of Return, Marvin purchased 7,000 shares of Strawn Corp. at $85.72 and sold them a year later at $102.66. With 5% commission rate on each transaction and a dividend of $6.91 per share throughout this year, what was the return on his investment? O a. 8.36% O b. 16.03% O c 14.80% O d. 7.68%