Determine whether any income must be recognized in each of the following situations, as well as who must report income, how much that taxpayer  should report, and when that taxpayer will report the income:

a. Patz Corporation owns a gourmet restaurant. The restaurant needs to remodel its kitchen but is short of cash. Dennis owns Tucky's Accessories, a restaurant supply store. The manager of Patz makes a deal with Dennis to have Tucky's do the kitchen remodeling, in exchange for which Patz will cater Tucky's company picnic. Tucky's does the remodeling and Patz caters the picnic. It costs Patz $800 to cater the picnic, a job for which it would have charged $1,500.

b. Geraldo is a sales manager who enjoys collecting antique guns. Geraldo attends various shows around the country at which collectors and dealers sell and trade guns. During the current year, Geraldo sells 3 guns for a total of $6,200 (the cost of the guns to Geraldo was $4,000) and purchases 2 guns at a total cost of $2,400. In addition, he exchanges a gun for which he had paid $700 for another gun worth $800.