The sum of two numbers is $\frac{23}{20}$ of the first number. The second number is what percent of the first?

In an examination in which full marks were $800,$ $A$ gets $20 \%$ more than $B,$ $B$ gets $20 \%$ more than $C,$ and $C$ gets $15 \%$ less than $D.$ If $A$ got $576,$ what percentage of full marks did $D$ get (approximately) (in $\%$)?

$A$ clerk received an annual salary of $Rs$ $3,660$ in the year $1975$. This was $20\%$ more than his salary in $1974$. What was his salary in $1974$?

The value of a machine depreciates at the rate of $10 \%$ every year. It was purchased $3$ years ago. If its present value is $₹ 8748$,what was its purchase price?

If the price of a shirt is increased by $25 \%$ and then decreased by $30 \%$,then what will be the net effect?

Anil's monthly income is $30 \%$ more than Ashok's. Ashok's monthly income is $10 \%$ less than Manoj's. If the difference between the monthly income of Anil and Manoj is $₹ 1360$,what is the monthly income of Ashok?