If $A$ is equal to $20 \%$ of $B$ and $B$ is equal to $25 \%$ of $C$,then what percent of $C$ is equal to $A$ (in $\%$)?

In an election between two candidates,one got $52 \%$ of the total valid votes. $25 \%$ of the total votes were invalid. The total number of votes were $8400$. How many valid votes did the other person get?

$0.15 \%$ of $33 \frac{1}{3} \%$ of $₹ 10000$ is

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

If $₹ 2800$ is $\frac{2}{7}$ percent of the value of a house,the worth of the house (in $₹$) is

If the height of a triangle is decreased by $40 \%$ and its base is increased by $30 \%$,what will be the effect on the area?