A new medical instrument costs $$50,000.$ Operating, maintenance, and repair costs are $$10,000$ for the first year, $$25,000$ for the second year, $$40,000$ for the third year, and $$55,000$ for the fourth year. The minimum attractive rate of return is $10\%.$ If the medical instrument is kept for four years, the annual net equivalent cost is most nearly

A$.$ $$10,000$

B$.$ $$12,500$

C$.$ $$45,000$

D$.$ $$46,500$

Clear selection