How many litres of pure acid are there in $8$ litres of a $20\%$ solution?

Water tax is increased by $20 \%$ but its consumption is decreased by $20 \% .$ Then the increase or decrease in the expenditure of the money is

For admission in a postgraduate program of Calcutta University,$90 \%$ of the candidates who appeared for the written test were males and the rest were females. $60 \%$ of the males and $80 \%$ of the females passed the written test. What is the total number of students who appeared for the written test,if the total number of passed candidates was $1240$?

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

The present population of a town is $26010$. It increases annually at the rate of $2\%$. What was the population of the town two years ago?

If inflation increases at a rate of $8 \%$ p.a.,what will a $₹ 20$ article cost at the end of two years?