If $x \%$ of $y$ is equal to $z,$ what per cent of $z$ is $x$ ?

$A$ village lost $12 \%$ of its goats in a flood and $5 \%$ of the remainder died from diseases. If the number left now is $8360$,what was the original number before the flood?

The population of a town increases by $5 \%$ annually. If its population in $2001$ was $138915$,what was it in $1998$?

The price of electricity has been increased by $25 \%$. If a person wants to keep the expenditure same,then the percentage reduction in use of electricity should be: (in $\%$)

In a recent survey,$40 \%$ of houses contained two or more people. Of those houses containing only one person,$25 \%$ had only a male. What is the percentage of all houses that contain exactly one female and no males (in $\%$)?

In an examination,$A$ got $25\%$ marks more than $B$,$B$ got $10\%$ less than $C$,and $C$ got $25\%$ more than $D$. If $D$ got $320$ marks out of $500$,the marks obtained by $A$ were: