From the salary of an officer,$10\%$ is deducted as house rent,$15\%$ of the rest he spends on children's education,and $10\%$ of the balance,he spends on clothes. After this expenditure,he is left with $₹ 1377$. His salary is:

An article is sold at a discount of $20 \%$ on the marked price. In order to gain $60 \%$ on the marked price,at how much more percent of the discounted price should it be sold?

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 $,000$)?

$A$ speaks truth in $80 \%$ of the cases and $B$ in $90 \%$ of the cases. Find the percentage when they contradict each other in describing the same facts. (in $\%$)

Akash scored $73$ marks in subject $A$. He scored $56 \%$ marks in subject $B$ and $X$ marks in subject $C$. Maximum marks in each subject were $150$. The overall percentage marks obtained by Akash in all three subjects together was $54 \%$. How many marks did he score in subject $C$?

$37 \frac{1}{2} \%$ of $₹ 48$ is: