Stephanie M. answered 04/24/15
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This is a problem that simply involves plugging in variables. For your problem, C = $1080 (the original cost), r = 0.2 (the rate of depreciation), and t = 4 (years that have gone by). Solve for V:
V = (1080)(1 - 0.2)4
V = (1080)(0.8)4
V = (1080)(0.4096)
V = 442.368
Rounding to the nearest cent, the value of the machine is $442.37.