please show work.

Firm commitment versus best efforts. Astro Investment Bank offers Lunar Vacations the following options on its initial public sale of equity: (a) a best efforts arrangement whereby Astro will keep 2.5% of the retail sales or (b) a firm commitment arrangement of $9,900,000. Lunar plans on offering 1,000,000 shares at $11.88 per share to the public. If it sells 100% of the shares, which is the better choice for Lunar Vacations? Which is the better choice for Astro Investment Bank