Astro investment bank offers lunar vacations the following options on its initial public sale equity: (a) a best efforts arrangement whereby Astro will keep 2.8% of the retail sales or (b) a firm commitment arrangement of $9,900,000. Lunar plans on offering 1,000,000 shares at $11.55 per share to the public. if it sells 100% of the shares, which is the better choice for lunar vacations? which is better choice for Astro investment bank ?