The value of a computer depreciates 25% each year. If the value of the computer is $3940 now, find the value of computer 2 years ago.
更新1:
no need to do the second question, i did it, thanks.
F.3 Maths
2013-09-24 9:40 pm
The value a printer is decreases from $5120 to $4500 in 2 years, find the depreciation rate per year.
The value of a computer depreciates 25% each year. If the value of the computer is $3940 now, find the value of computer 2 years ago.
The value of a computer depreciates 25% each year. If the value of the computer is $3940 now, find the value of computer 2 years ago.
回答 (1)
2013-09-24 9:55 pm
✔ 最佳答案
Let r% be the depreciation rate5120 x (1 + r%)^2 = 4500
(1 + r%)^2 = 0.87890625
1 + r% = 0.9375
r% = -0.0625
r = -6.25
therefore, the depreciation rate is 6.25%
Let $x be the value of computer 2 years ago
x(1 - 25%)^2 = 2940
0.5625x = 2940
x = 5226.7
therefore, the value of computer 2 years ago is $5226.7
參考: knowledge
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