skysong realty corporation purchased a tract of unimproved land for $55,000. this land was improved and subdivided into building lots at an additional cost of $34,460. these building lots were all of the same size but owing to differences in location were offered for sale at different prices as follows. group 1 2 3 no. of lots 9 15 17 price per lot $3,000 4,000 2,400 a operating expenses for the year allocated to this project total $18.200. lots unsold at the year-end were as follows. group 1 group 2 group 3 4 lots 6 lots 1 lots at the end of the fiscal year skysong realty corporation instructs you to arrive at the net income realized on this operation to date.