Sherika's boss gave her two tickets to the 90 Inch Nails concert because she met her sales quota. At the time Sherika received the two tickets, they had a face value of $100 each and were selling on eBay for $200 each (which equaled the fair market value of the tickets). On the date of the concert, the tickets were selling for $300 each. Sherika and her daughter (Xiomara) attended the concert. How much gross income should Sherika report as a result of the tickets?
a. $600
b. $400
c. $200
d. $0