If $75 \%$ of a number is added to $75$,the result is the number itself. The number is:

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:

The $75 \%$ of a number is $380$ more than $35 \%$ of the same number. What is $20 \%$ of that number?

If an electricity bill is paid before the due date,one gets a reduction of $4 \%$ on the amount of the bill. By paying the bill before the due date,a person got a reduction of $₹ 13$. The amount of his electricity bill was:

The income of a company increases $20 \%$ per annum. If its income is $Rs$ $42664000$ in the year $1999$,what was its income in the year $1997$?

If the length and breadth of a rectangular field are increased,the area increases by $50 \%$. If the length is increased by $20 \%$,by what percentage was the breadth increased?