The number that is to be added to $10 \%$ of $320$ to have the sum as $30 \%$ of $230$ is

$A$'s salary is $20 \%$ less than $B$'s salary. Then $B$'s salary is more than $A$'s salary by:

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

What percentage of numbers from $1$ to $70$ have squares that end in the digit $1$?

Of the $1000$ inhabitants of a town,$60 \%$ are males of whom $20 \%$ are literate. If,of all the inhabitants,$25 \%$ are literate,then what per cent of the females of the town are literate (in $.5$)?

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: