Rex Companys books show an inventory balance of $20,000 at December 31, but four in-transit shipments are not included in this amount (shown below). What is the actual inventory balance at December 31?

Purchase from ABC Corp. for $4,000, FOB shipping point

Purchase from DEF Co. for $1,000, FOB destination

Sale to GHI Corp. for $2,000, FOB shipping point

Sale to JKL Co. for $3,000, FOB destination