Express the following as a decimal, fraction and percentage.

$\frac{9}{10}$

Express the following as a decimal, fraction and percentage.

$0.45$

Express the following as a decimal, fraction and percentage.

$\frac{85}{100}$

Express the following as a decimal, fraction and percentage.

$72\%$

Arun spent $72\%$ of his pocket money on buying books and the remaining money to buy a gift for his friend. What percentage of his total money did Arun spend on buying the gift?

$81\%$ of girls in a class like roses and the remaining like jasmine. What percentage of the remaining girls in the class like Jasmine?

Out of $42$ students in a class, $30$ students stay in the hostel. Find the percentage of the students staying in the hostel.

There are $80$ books on a rack and $64$ of them are novels. Find the percentage of the novels on the rack.

The table given below shows the total number of students and the number of girls studying in primary classes at a school. Express the number of girls as a percentage.