Aditya's salary is $80\%$ of Amit's salary and $120\%$ of Rajiv's salary. What is Amit's salary if Rajiv's salary is $30,000$ (in $,000$)?

In a recent survey,$40 \%$ of houses contained two or more people. Of those houses containing only one person,$25 \%$ had only a male. What is the percentage of all houses that contain exactly one female and no males (in $\%$)?

$37 \frac{1}{2} \%$ of $₹ 48$ is:

$134 \%$ of $3894 + 38.94$ of $134 = ?$

If Rs. $2800$ is $\frac{2}{7}$ of the value of a house,what is the total worth of the house (in Rs.)?

Aditya's salary was increased by $40 \%$ and then decreased by $25 \%$. Find the net effect on Aditya's salary.