1.
Business
An analyst estimates that the computers his company just bought will depreciate at a rate of 25% per year. At this rate, approximately how long will it take a computer to depreciate to 30% of its original value?
A.
3 years
B.
10 years
C.
4 years
D.
5 years
Hint
2.
Radioactivity
The half-life of uranium-232 is 72 years. Find the approximate value of
k
in the formula
y
=
ne
kt
for uranium-232. Assume
t
is in years.
A.
-0.0048
B.
-0.0096
C.
-0.0024
D.
0.0012
Hint
3.
Population
The population of Redville grew from 5432 in 1990 to 7116 in 2000. Assuming the population is growing exponentially, predict the population of Redville in 2005.
A.
about 7960
B.
about 8140
C.
about 8290
D.
about 8360
Hint
4.
A Mickey Mantle rookie card appreciates in value 2% every year. How much was it worth in 1990 if it is worth $35,000 in 2000?
A.
$216,711
B.
$28, 712
C.
$42,665
D.
$5653
Hint
5.
Suppose a new car loses value at 10% per year for the first 5 years. When should the owner sell it if they want to receive 75% of what they paid for it?
A.
after 2.5 years
B.
after 2.73 years
C.
after 2 years
D.
after 3 years
Hint