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Rashed12
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The population of a town increases by 4% per annum and the population 11 Apr 2020, 13:11
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

55% (hard)

Question Stats:

66% (02:27) correct 34% (02:34) wrong based on 177 sessions

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The population of a town increases by 4% per annum and the population of that town was 2000000 persons. What will be the population of that town after 3 years?

A) 2249728 persons.

B) 2247728 persons.

C) 2249828 persons.

D) 2259728 persons.

E) 2248728 persons.­
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gurmukh
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The population of a town increases by 4% per annum and the population 11 Apr 2020, 18:30
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Population after 3 years=
2000000(1.04)^3= 2249728
Option A is the answer

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RC_xx
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The population of a town increases by 4% per annum and the population 22 May 2024, 08:08
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gurmukh
Population after 3 years=
2000000(1.04)^3= 2249728
Option A is the answer

Posted from my mobile device
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­How it is possible to solve this problem in less then 2 minutes with these, not diffucult but long calculus? Any strategies? Also all the possibile answer are very similar to each other, thus it  becomes hard to try t indentify the possible answer using approximation..
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Jsgambach
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The population of a town increases by 4% per annum and the population 22 May 2024, 12:34
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RC_xx

gurmukh
Population after 3 years=
2000000(1.04)^3= 2249728
Option A is the answer

Posted from my mobile device
­How it is possible to solve this problem in less then 2 minutes with these, not diffucult but long calculus? Any strategies? Also all the possibile answer are very similar to each other, thus it  becomes hard to try t indentify the possible answer using approximation..
Show more
­
I got it in a bit less than 2 min. You must though be familiar with mental calculation of percentages, I used the 1% strategy and multiplied it by 4, which I thought was quicker.
My path was:

year 0: 2.000.000
year 1: 2.080.000 (20.000 is 1%, 80.000 is 4%)
year 2: 2.163.200 (20.800 is 1%, 83.200 is 4%)
year 3: 2.249.728 (21.632 is 1%, 86.528 is 4%)

Calculating 1% is simple and quick, and 4% is just 1% 4 times, and mentally multiplying by 4 is easier (by 2 by 2). Then add the result (if not familiar, manually add, it should not take long). 

Hope its useful.­
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