How much should Cano report as foreign exchange transaction gain or loss as part of 2007 income?

On September 1, 2006, Cano & Co., a US corporation, sold merchandise to a foreign firm for 250,000 Botswana pula. Terms of the sale require payment in pula on February 1, 2007. On September 1, 2006, the spot exchange rate was $.20 per pula. At December 31, 2006, Cano’s year-end, the spot rate was $.19, but the rate increased to $.22 by February 1, 2007, when payment was received. How much should Cano report as foreign exchange transaction gain or loss as part of 2007 income?

$0.
$2,500 loss.
$5,000 gain.
$7,500 gain.