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# M01-09

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Senior Manager
Status: Some status
Joined: 28 Jun 2012
Posts: 328

Kudos [?]: 57 [0], given: 286

Location: United States (WA)
GMAT 4: 710 Q59 V58
GRE 1: 100 Q100 V100
GRE 2: 250 Q120 V100
GRE 3: 45 Q V30
GPA: 3.13
WE: Project Management (Insurance)

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22 Dec 2014, 08:10
The population of Linterhast was 3,600 people in 1990 and 4,800 people in 1993. If the population growth rate per thousand is constant, then what will be the population in 1996?

A. 6,000
B. 6,400
C. 7,200
D. 8,000
E. 9,600

Kudos [?]: 57 [0], given: 286

Senior Manager
Status: Some status
Joined: 28 Jun 2012
Posts: 328

Kudos [?]: 57 [0], given: 286

Location: United States (WA)
GMAT 4: 710 Q59 V58
GRE 1: 100 Q100 V100
GRE 2: 250 Q120 V100
GRE 3: 45 Q V30
GPA: 3.13
WE: Project Management (Insurance)

### Show Tags

22 Dec 2014, 08:10
Official Solution:

The population of Linterhast was 3,600 people in 1990 and 4,800 people in 1993. If the population growth rate per thousand is constant, then what will be the population in 1996?

A. 6,000
B. 6,400
C. 7,200
D. 8,000
E. 9,600

This is a set rate problem. If the population grew by 1,200 people in the past three years, then it grew by 33 percent:
$$\frac{4800-3600}{3600} = \frac{1200}{3600} = \frac{1}{3} \approx 33%$$

Therefore in the next three years the population will grow at the same rate of 33% because the growth rate has been constant.

$$4,800 + \frac{1}{3}*4,800 = 4,800 + 1,600 = 6,400$$

Another approach is to backsolve by comparing the ratio of each answer to 4,800. For example, the ratio of 7,200 to 4,800 is not the same as the ratio of 4,800 to 3,600.

Kudos [?]: 57 [0], given: 286

Intern
Joined: 15 Sep 2014
Posts: 1

Kudos [?]: [0], given: 11

Location: Angola
GMAT 1: 660 Q54 V48
GPA: 3.89

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01 Nov 2017, 01:53
mpmbtr wrote:
The population of Linterhast was 3,600 people in 1990 and 4,800 people in 1993. If the population growth rate per thousand is constant, then what will be the population in 1996?

A. 6,000
B. 6,400
C. 7,200
D. 8,000
E. 9,600

A. 6,000
B. 6,400
C. 7,200
D. 8,000
E. 9,600
A. 6,000
B. 6,400
C. 7,200
D. 8,000
E. 9,600

Kudos [?]: [0], given: 11

Re: M01-09   [#permalink] 01 Nov 2017, 01:53
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# M01-09

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