D Question 15 2 pts At the end of the third year of its six-year life, a piece of equipment on the balance sheet of ABC Company has a net book value of $18,000. On January 1 of Year 4 ABC incurs $2,500 of ordinary repair and maintenance costs and also makes $3,000 of improvements to the equipment. The $3,000 improvement extends the life of the equipment by two years. What is the net book value of the equipment on January 1 of Year 4 immediately after ABC records the $2,500 and the $3,000 expenditures? O $21,000 O $23.500 $18,000 $20,500