Answer :
The value of machinery after 4 years is $6,100, So option 'C' is the correct answer to the following question.
Value function based problem:
What information do we have?
f(t) = 12,500 - 1,600t
Time taken = 4 year
Function
f(t) = 12,500 - 1,600t
f(4) = 12,500 - 1,600(4)
f(t) = 12,500 - 6,400
Value function = $6,100
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