An agent sells goods of value of Rs. $15000$. The commission which he receives is $12 \frac{1}{2} \%$. What is the commission amount?

If in an examination $20 \%$ students failed in Hindi,$25 \%$ failed in English,and $7 \%$ failed in both subjects,then what is the percentage of students who failed in at least one of the subjects (in $\%$)?

The sum of two numbers is $2490$. If $6.5\%$ of one number is equal to $8.5\%$ of the other,then the numbers are:

Sonu invested $10 \%$ more than Mona. Mona invested $10 \%$ less than Raghu. If the total sum of their investments is ₹$5,780$,how much amount did Raghu invest?

Water tax is increased by $20 \%$ but its consumption is decreased by $20 \% .$ Then the increase or decrease in the expenditure of the money is

What percentage of numbers from $1$ to $70$ have squares that end in the digit $1$?