Question

Solve any 2
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Answer 1

Answer:

1). Let the rate of increase in the population is r

we know, population increases geometrical progression so, we have to use  formula

Given, P = 16,000

time period , n = 2

population after 2 yrs , A = 17640

use formula

so, 17640 = 16000(1 + r/100)²

=> 17640/16000 = (1 + r/100)²

=> 1764/1600 = (1 + r/100)²

=> 441/400 = (1 + r/100)²

taking square root both sides,

=> 21/20 = 1 + r/100

=> 21/20 - 1 = r/100

=> 1/20 × 100 = r

r = 5 %

2).l= 2.1m d= 1.4m r= 0.7 n= 500

area covered =2n pai =r×l

2×500×0.7×2.1

=4620sq.m

cost of travelling =4620×7

=323,40

4620sq.m, 32340

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Answer 2

Answer:

1. 5.125%per year

Step-by-step explanation:

1. Population after 1 year

=(17640-16000)/2

=1640/2

=820

=>Increase rate = (Increase/original)×100

=(820/16000)×100

=82/16

=41/8

=5.125%per year

2.