Concord Corporation purchased a tract of unimproved land for $$647,000.$ This land was improved and subdivided into bullaing lots at an additional cost of $$122,000.$ These building lots were all of the same size but owing to differences in location were offered for sale at different prices as follows:

$\backslash$table$[[$Group$,$No$.$ of Lots,Price per Lot$],[1,21,$$$23,600$