$3.5$ can be expressed in terms of percentage as

An inspector rejects $0.08 \%$ of the meters as defective. How many will he examine to reject $2$?

If $\frac{3}{5}$ of a number is $23$ more than $50 \%$ of the same number,then what will be $80 \%$ of the number?

$A$ man spends $75 \%$ of his income. His income is increased by $20 \%$ and he increases his expenditure by $10 \%$. His savings are increased by: (in $\%$)

If $10 \%$ of $x$ is $3$ times $15 \%$ of $y,$ then find $x: y.$

$A$ person spends $25 \%$ of his annual income on house rent,$15 \%$ on education of children,and $45 \%$ on other items. If he saves $₹ 14,400$ annually,then the person's total income is: (in $,000$)