An office machine is purchased for ​$6400. Assume that its salvage​ value, V, in​ dollars, depreciates, according to a method called double declining​ balance, by 40​% each year and is given by V(t)=6400(0.60)t​, where t is the​ time, in​ years, after purchase.   ​a) Find V(9)​, and explain its meaning. ​b) Find V′(9)​, and explain its meaning. ​c) When will the salvage value of the office machine be half of the purchase​ price

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