Question

52. The strength of a school increases and decreas- es in every alternate year by 10%. It started with increase in 2000. Then the strength of the school in 2003 as compared to that in 2000 was SSC CGL (Tier-In 2014 (1) increased by 8.9% (2) decreased by 8.9% (3) increased by 9.8% (4) decreased by 9.8% CG

11th - 12th Class

Maths

Solution

122

4.0 (1 ratings)

Sol. (1) Increase in Ist year ( =10 % ) Decrease in 2 nd year ( =10 % ) Effective result ( =left(10-10-frac{10 times 10}{100}right) % ) ( =-1 % ) Increase in 3 rd year ( =10 % ) ( therefore ) Effective result ( =left(10-1-frac{10 times 1}{100}right) % ) ( =(9-0.1) %=8.9 % ) (increase)