13. If the annual decrease in the population of a town be 5% and the present population be 68590, what was it three years ago?
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1
Step-by-step explanation:
Correct option is A)
Present population, P=68590
Let R=5%
The population three years ago
= =
(1−
100
R
)
3
P
=
(1−
100
5
)
3
68590
=
(
20
19
)
3
68590
=
19×19×19
68590×20×20×20
=
6859
548720000
=80,000
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