The radius of a sphere is increased by $10 \%$. The surface area increases by

$40 \%$ of $? = 240$

From a container having pure milk,$20 \%$ is replaced by water and the process is repeated thrice. At the end of the third operation,the milk is: (in $\%$ pure)

The difference of two numbers is $20 \%$ of the larger number. If the smaller number is $20$,then the larger number is:

What is $15$ percent of $ 34$?

An index of $12$ shares contains,among others,the shares of Vision Power,Vision Infra,and Vision Communication with weightage of $7\%$,$13\%$,and $15\%$ respectively. What is the increase in the prices of other shares,if these three rise by $9\%$,$10\%$,and $4\%$ respectively,while the index rises by $6\%$?