Jordan paid $30,000 for equipment two years ago and has claimed total depreciation deductions of $15,600 for the two years. The cost of repairs during the same time period was $2,000 while a major overhaul that extended the life of the equipment cost $7,000. What is Jordan's adjusted basis in the equipment at the end of the two-year period? 

a) $16,400 

b) $14,400 

c) $30,000 

d) $21,400