Exam Maths Puzzle Numerical Ability

If birth rate and death rate of a city is 10% each find population of the city after 2 years.current population of the city is 3000.
A. 3000
B. 2940
C. 3060
D.3630

Read Solution (Total 3)

3000*11/10*11/10
=3630
7 years agoHelpfull: Yes(1) No(0)

3000+10% of 3000
3300
3300-10% of 3300
2970
2970+10% of 2970
3267
3267-10% of 3267
2940
hence B.
9 years agoHelpfull: Yes(0) No(0)
current=3000+300(10%)=3300+330(10%)=3630(D)
7 years agoHelpfull: Yes(0) No(0)

Exam Other Question

the operation*is defined by *x=2x-10 then *(*9) is XYZ + ZXY = ZYX

where X,Y and Z are 0-9 digits. i.e.,
if number = 123 = XYZ ==> X=1,Y=2,Z=3.