Use the information below to answer questions below

Work-in-progress 1/1........................N1,000
Work-in-progress 31/12......................N2,000
Production cost of goods manufactured.......N20,000
Sales.......................................N50,000
Stock of finished goods 1/1.................N4,000
Stock of finished goods 31/12...............N5,000
Selling and distribution expenses...........N2,000
Administrative expenses.....................N1,000

Determine the gross profit?