A delivered price $($including attachments$)$ of a crawler dozer tractor is $$121,900$ with a residual value of $40\%.$ The useful life of tractor is $6,900$ hours.

a$.$ What is total amount of depreciation allowed?

Total amount

b$.$ What is the amount of depreciation per hour?

Note: Round your answer to the nearest cent.

Amount of depreciation $($per hour$)$

c$.$ If the tractor is operated five days a week for an average of $7\mathrm{.}5$ hourso day, what would be the depreciation for the first yea

Depreciation for the first year

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$1$ of $4$

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d$.$ If the hours of operation were the same each year, what would be the total number of years of useful life for the tractor?

Note: Round "years" to the nearest whole number.

Total number of years