Some articles were bought at $6$ for $Rs. 5$ and sold at $5$ for $Rs. 6$. The gain percent is:

$A$ man buys $10$ oranges for a rupee and sells $8$ oranges for a rupee. What is the profit percent?

The list price of a book is $Rs. 100$. $A$ dealer sells three such books for $Rs. 274.50$ after allowing a discount at a certain rate. Find the rate of discount in $\%$.

If a commission at the rate of $10 \%$ is given to a bookseller on the marked price of a book by the publisher,the publisher gains $20 \%$. If the commission is increased to $15 \%$ then the gain percent would be

$A$ reduction of $10 \%$ in the price of rice enables a person to obtain $25 \text{ kg}$ more for $Rs. 2250$. Find the reduced price per $\text{kg}$ of the rice (in $Rs.$).

If a company sells a car with a marked price of $Rs. 272000$ and gives a discount of $4\%$ on $Rs. 200000$ and $2.5\%$ on the remaining amount of $Rs. 72000$,then the actual price charged by the company for the car is (in $Rs.$)