Express the following fractions as a percent:

$\frac{3}{4}$

Express the following fraction as a percent:

$\frac{53}{100}$

If the fraction $1\frac{3}{5}$ is expressed in the form of $k\%$, then find the value of $k$.

If the percentage of the fraction $\frac{7}{20}$ is expressed as $k\%$, then find the value of $k.$

Express the following ratio as per cent:

$4:5$

Express the following ratios as percent:

$1:5$

Express the following ratio as percent(express the answer in fraction):

$11: 125$

Express the following percent as ratio in the simplest form:

$2.5\%$

Express the following percent as ratio in the simplest form:

$0.4\%$