Apiece of machinery valued at $250,000 depreciates at 12% per year by the fixed rate method. after how many years will the value have depreciated to 100,000

6.7 years (approx)

Step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c