If the given two numbers are respectively $7 \%$ and $28 \%$ of a third number,then what percentage is the first of the second?

The monthly income of a person is $Rs. 5000$. If his income is increased by $30\%$,then what is his monthly income now?

The product of one-third of a number and $150 \%$ of another number is what percent of the product of the given numbers?

If $₹ 2800$ is $\frac{2}{7}$ percent of the value of a house,the worth of the house (in $₹$) is

In an examination,$37 \frac{1}{2} \%$ of the candidates were girls. If $75 \%$ of the boys and $62 \frac{1}{2} \%$ of the girls passed,and $342$ girls failed,find the number of boys who failed.

Evaluate $28 \%$ of $450 + 45 \%$ of $280$.