What is $15$ percent of $ 34$?

If the price of apples goes down by $10 \%,$ find the percentage of increase that a family should effect in its consumption so as not to increase expenditure on this account.

The population of a town $2$ years ago was $62500$. Due to migration to big cities,it decreases every year at the rate of $4\%$. The present population of the town is:

In an examination,$5 \%$ of the applicants were found ineligible and $85 \%$ of the eligible candidates belonged to the general category. If $4275$ eligible candidates belonged to other categories,then how many candidates applied for the examination?

If $18 \%$ of a number is $720,$ then what is $81 \%$ of the same number?

If $A$ is $150 \%$ of $B$,then $B$ is what percent of $A+B$?