$37.$ Which of the following assets has the longest class life $($number of years in which depreciation can be deducted using the modified accelerated cost recovery system$)?$

a$.$ office building

b$.$ packagaing machines

c$.$ cars

d$.$ computers

$38.$ Green Light Trading Co$.$ purchased a transmission belt equipment at a cost of $$500,000.$ According to the concept of Time Value of Money, which of the following way of depreciation provides the best value? Assume that all of the following ways are legally acceptable.

a$.$ Immediately deduct all the cost of the equipment in the first year

b$.$ Depreciation using the $150\%$ accelerated depreciation

c$.$ Depreciation using the $200\%$ accelerated depreciation

$39.$ Green Light Trading Co$.$ purchased a transmission belt equipment at a cost of $$500,000.$ The equipment was placed in service in Green Light Trading$$s distribution center in February $20$X$3.$ Green Light Trading Co$.$ estimated that the equipment had a useful life of $10$ years with a salvage value of $$10,000.$ The General Depreciation System $($GDS$)$ provided by the IRS showed that the life of the equipment based on the Modified Accelerated Cost Recovery System $($MACRS$)$ was $7$ years. What is the useful life that should be used to determine Green Light Trading Co$.$s taxable income?

a$.7$ years

b$.10$ years

c$.3$ years

d$.12$ years