If $x \%$ of $y$ is equal to $z,$ what per cent of $z$ is $x$ ?

The population of a town was $48600$. It increased by $25\%$ in the first year and decreased by $8\%$ in the second year. What will be the population of the town at the end of $2$ years?

Express $8 \frac{1}{3} \%$ as a fraction.

When $40$ is subtracted from $30 \%$ of a number,the result is $50$. What is the value of the number?

If $25 \%$ of a number is subtracted from a second number,the second number reduces to its five-sixths. What is the ratio of the first number to the second number?

If $x$ is $80 \%$ of $y$,then what percent of $2x$ is $y$?