What percent of $4 \text{ km}$ is $8 \text{ meters}$?

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

If $60 \%$ of $A = 30 \%$ of $B$,$B = 40 \%$ of $C$ and $C = x \%$ of $A$,then the value of $x$ is:

Two litres of water evaporate from $10$ litres of a solution containing $10 \%$ salt. The percentage of salt in the remaining solution is

How much pure alcohol has to be added to $400 \text{ ml}$ of a solution containing $15 \%$ alcohol to change the concentration of alcohol in the mixture to $32 \%$?

Six-elevenths of a number is equal to $22 \%$ of a second number. The second number is equal to one-fourth of a third number. The value of the third number is $2400$. What is $45 \%$ of the first number?