The population of a town is 16200. It decreases annually at the rate of 40% p.a. What was its population 3 years ago?

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14 Sep 2021 Population The population of a town is 16200. It decreases annually at the rate of 40% p.a. What was its population 3 years ago?: OPtion
1. 75000
2. 65000
3. 84900
4. 93600
5. 92363
6. 68655
7. 83365
8. 91190
9. 78875
10. None of the above; Correct Option: 1 Best Solution (3)

Billal Hossain 3 years AGO

3 years ago population was = [16200/{1-(40/100)}^3]
= {16200/(60/100)^3}
= {16200*(100/60)*(100/60)*(100/60)}
= {16200*(5/3)*(5/3)*(5/3)}
= 16200*(125/27)
= 600*125
= 75000
Hence, My option is (1)

Like? Yes (1) | No

Varun 3 years AGO

75k-0.4*75k = 45k
45k-0.4*45k= 27k
27k-0.4*27k= 16,200
= Option (1)

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RAMADURAI NATESAN 3 years AGO

ans = 16k200 / (.6) ^3 = 75000

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Dimple

India

Punjab

Time: 00:01:33

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The population of a town is 16200. It decreases annually at the rate of 40% p.a. What was its popula

M4maths Previous Puzzles

14 Sep 2021 Population