Milk contains $5 \%$ water. What quantity of pure milk should be added to $10$ litres of milk to reduce this to $2 \%$?

The population of a town increased from $1,75,000$ to $2,62,500$ in a decade. The average per cent increase of population per year is

If the side of a square is increased by $30 \%,$ its area is increased by:

$A$ $20 \%$ raise of price followed by a discount of $25 \%$ on the raised price will:

The price of a table depreciates every year by $20 \%$. If the value of the table after $2$ years is $Rs$ $32,000$,then what is the present price (in $Rs$) of the table (in $,000$)?

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: