At the beginning of Year 1, Arby's purchased a new air fryer that cost $40,000. The fryer has an estimated useful life of 8 years and an estimated residual value of $8,000. What amount of depreciation expense should Arby's recognize in Year 2 assuming the double-declining balance method?

a.$8,000

b. $6,000

c. $7,500

d. $10,000