Rahim bought a gift item for $Rs. 510$ after getting a discount of $15 \%$. He then sells it $5 \%$ above the marked price. The profit earned in this deal is (in $Rs.$)

$A$ man sells each of his $2$ articles for $Rs. 99$. On one he gains $10 \%$ and on the other he incurs a loss of $1 \%$. What is his total gain in $\%$ in the entire transaction?

If the cost price of $21$ watches is equal to the selling price of $18$ watches,then what would be the gain percent in this transaction?

The price of an article is raised by $30 \%$ and then two successive discounts of $10 \%$ each are allowed. Ultimately,the price of the article is

Mohit purchased $40 \, kg$ of wheat at $Rs. 12.50$ per $kg$ and $25 \, kg$ of wheat at $Rs. 15.10$ per $kg$. He mixed the two qualities of wheat for selling. At what rate should it be sold to gain $10 \%$? (in $Rs.$)

$X$ sells two articles for $Rs. 4,000$ each with no loss and no gain in the transaction. If one was sold at a gain of $25\%$, the other is sold at a loss of ........$\%$.