An investment banker may agree to either underwrite an issue of 5 million shares of stock for Lowder Inc. on a firm commitment basis or engage on a best effort basis. If the investment banker underwrites the issue, he will pay $8.50 per share to Lowder Inc. He may then sell those shares to the public for $9.20 per share. If the investment banker engages on a best effort basis, he may earn a commission based on the selling price per share. If the investment banker can sell the entire share issue, at what commission rate would he be indifferent between a firm commitment and a best efforts arrangement? (rounded) O 8.29% 5.06% O 7.61% O 5.56% O 6.53%