For each of the following land sales, prepare the journal entry that would be recorded and indicate the amount of the gain or loss that would be reported. Assume that in each case the sale of land isn't a main business activity of the entity.
a. Land costing $500,000 is sold for $410,000.
b. Land costing $1,300,000 is sold for $4,000,000.
c. Land costing $1,800,000 is sold for $1,800,000.