Last year, the population of a town was x and if it increases at the same rate, next year it will be y. the present population of the town is
Select the correct option
A) (x+y)/2
B) (y-x)/2
C) 2xy/x+y
D) √xy
E) None
Solution: Let the present population of the town be P.Using compound interest formula   Then, P = x(1+(R/100)); ------(i)   And y = P(1+(R/100)) = P*P/x; -------(ii)   P2 = xy;   Hence, P = √xy.   Answer: Option √xy
<result>D</result>
Last year, the population of a town was x and if it increases at the same rate, next year it will be y. the present population of the town is