Depreciation applicable to an equipment is $20 \%$. The value of the equipment $3$ years from now will be less by: (in $\%$)

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

Amit donated $20\%$ of his income to a school and deposited $20\%$ of the remainder in his bank. If he has $₹ 12800$ now,what is the income (in $₹$) of Amit?

The population of a town is $9000$. If the number of females increases by $5 \%$ and the males by $7.5 \%$,what will be the total population after the increase? The number of females currently is $3000$.

In a recent opinion poll held during April,$60 \%$ of the respondents favoured India Against Corruption $(IAC)$ while the rest favoured Indian political parties $(IPP).$ It was found in May polls that $10 \%$ of $IAC$ supporters switched their preference to $IPP,$ while the same percentage of $IPP$'s supporters also switched their preference to $IAC.$ What percentage of the electorate should now switch their preference from $IAC$ to $IPP$ so that they are at par?

In an examination,it is required to get $256$ of the total maximum aggregate marks to pass. $A$ student gets $192$ marks and is declared failed. The difference between the marks obtained by the student and the marks required to pass is $10 \%$. What are the maximum aggregate marks a student can get?