On January 1, 20X0, Celt Corp. issued 9% bonds in the face amount of $1,000,000, which mature on January 1, 20X10. The bonds were issued for $939,000 to yield 10%, resulting in a bond discount of $61,000. Celt uses the interest method of amortizing bond discount. Interest is payable annually on December 31. At December 31, 20X0, Celt's unamortized bond discount should be

a. $51,610

b. $52,000

c. $57,100

d. $51,000