Facebook had only one angel investor, Peter Thiel (the founder of PayPal). Mr. Thiel invested more than once in Facebook, both as an angel and, in later rounds, on behalf of investors in his venture capital firm, Founders Fund. As an angel, Mr. Thiel invested $500,000 in September 2004. Assuming that all the shares he received in the angel round were registered under the name Rivendell One LLC, use the information in the prospectus to calculate:

a. The per share price he paid as an angel.

b. The amount of money he received from the IPO.

c. The holding period return (using the IPO price) he made on his investment.