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QOTD#20 In 2009, the price of each Econolux car increased by
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03 Apr 2017, 04:26
03 Apr 2017, 04:26
1
Expert Reply
00:00
Question Stats:
67% (02:10) correct
32% (01:52) wrong based on 53 sessions
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In 2009, the price of each Econolux car increased by 10 percent from the 2008 price. In 2010, they decreased by 5 percent and now cost between $18,000 and $19,800. Which of the following could be the price of a 2008 Econolux car?
Indicate all possible values.
A. $17,030
B. $17,230
C. $18,180
D. $18,935
E. $18,955
F. $20,790
Indicate all possible values.
A. $17,030
B. $17,230
C. $18,180
D. $18,935
E. $18,955
F. $20,790
Drill 4
Question: 1
Page: 321
Question: 1
Page: 321
Re: QOTD#20 In 2009, the price of each Econolux car increased by
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17 Apr 2017, 09:51
17 Apr 2017, 09:51
1
Expert Reply
Explanation
It’s useful to use plugging values in this problem.
Note that increasing something by 10 percent is the same as multiplying by 1.10, and decreasing something by 5 percent is the same as multiplying
by 0.95.
Definitely use your on-screen calculator on a problem such as this. Because you are dealing with a range, it will save you time to work from the top down until you reach a correct answer, then work your way from the bottom up until you reach a correct answer. Each answer in between the smallest correct answer and the largest correct answer must also be correct.
di new1.jpg [ 18.01 KiB | Viewed 5256 times ]
Hence option B,C and D are correct!
It’s useful to use plugging values in this problem.
Note that increasing something by 10 percent is the same as multiplying by 1.10, and decreasing something by 5 percent is the same as multiplying
by 0.95.
Definitely use your on-screen calculator on a problem such as this. Because you are dealing with a range, it will save you time to work from the top down until you reach a correct answer, then work your way from the bottom up until you reach a correct answer. Each answer in between the smallest correct answer and the largest correct answer must also be correct.
Attachment:
di new1.jpg [ 18.01 KiB | Viewed 5256 times ]
Hence option B,C and D are correct!
Re: QOTD#20 In 2009, the price of each Econolux car increased by
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11 Jan 2019, 22:25
11 Jan 2019, 22:25
1
Expert Reply
Guys,
just plug in the lowest and highest values given in the range
1.1*.95x1= 18000
x1=17224
then do
1.1*.95x=19800
x=18,947
so choose all values between 17224 and 18947
the answers are B,C,D
just plug in the lowest and highest values given in the range
1.1*.95x1= 18000
x1=17224
then do
1.1*.95x=19800
x=18,947
so choose all values between 17224 and 18947
the answers are B,C,D
