Mike is active with his alma mater. This year, Mike contributed $11,000 of highly appreciated stock and $20,000 cash to an endowment appeal. He also contributed 100 hours of his time normally billed at $200 an hour. If no further charitable contributions were made this year, what is the total value of Mike's charitable contributions?

1. a.$20,000
2. b.$31,000
3. c.$51,000
4. d.Cannot determine without Mike's AGI