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 $\%$)?

Two numbers are $50 \%$ and $80 \%$ less than a third number. By what percentage must the second number be increased to make it equal to the first number?

$x \%$ of $y + y \%$ of $x = ?$

An agent gets a commission of $2.5 \%$ on the sales of cloth. If on a certain day,he gets Rs. $12.50$ as commission,the cloth sold through him on that day is worth?

In a motor of $120$ machine parts,$5 \%$ parts were defective. In another motor of $80$ machine parts,$10 \%$ parts were defective. For the two motors considered together,the percentage of defective machine parts was (in $\%$)

Express $\frac{7}{8}$ as a percentage.