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The population of a particular area A of a city is 5000. It increases by 10% in 1st yr. It decreases by 20% in the 2nd yr because of some reason. In the 3rd yr, the population increases by 30%. What will be the population of area A at the end of 3 yr ?

A flywheel is in the form of a uniform circular disc of radius 1 m and mass 2 kg . The work which must be done on it to increase its frequency of rotation from 5 to 10 rev//s is approximately

A man makes attempts to hit the target. The probabilty of hitting the target is (3)/(5) . Then the probability that a man hits the target exactly 2 times in 5 attempts, is

Between two railway station the ratio of fare of 1^(st) and 2^(nd) class was 10:7 and later on the fare is increased in the ratio 3 : 4 and 5: 9 respectively. If the ratio of no. of passengers of both tier is 3 : 5 and total fare is Rs 30900 then find the total fare of 2^(nd) tier.

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