5. On July 25 of this year, Raj sold land with a cost of $15,000 for $40,000. Raj collected $20,000 this year and is scheduled to receive $5,000 each year for four years starting next year plus an acceptable rate of interest. Raj's gain recognized this year is A. $7,500. B. $12,500. C. $20,000. D. $25,000