On November 6, 20X7, Zucor Corp. purchased merchandise from an unaffiliated foreign company for 50,000 units of the foreign company's local currency. On that date, the spot rate was $1.259. Zucor paid the bill in full three months later when the spot rate was $1.258. The spot rate was $1.255 on December 31, 20X7. What amount should Zucor report as a foreign currency transaction gain in its income statement for the year ended December 31, 20X7?

a. $0

b. $50

c. $150

d. $200