The cost of an article including the sales tax is $Rs.\, 616$. The rate of sales tax is $10 \%$, if the shopkeeper has made a profit of $12 \%$, then the cost price of the article is in $Rs.$?

A rice trader buys $16$ quintals of rice for $Rs.\, 5632$. $20 \%$ rice is lost in transportation. At what rate should he sell to earn $25 \%$ profit in $Rs.$ per quintal?

A trader marked the price of his commodity so as to include a profit of $25 \% .$ He allowed discount of $16 \%$ on the marked price. His actual profit was (in $\%$)

A man sells a scooter to his friend at $10 \%$ loss. If the friend sells it for $RS.\, 4000$ and gains $20\%,$ find out the original cost price of the scooter. (in $Rs.$)

An article is listed at $Rs.\,65.$ A customer bought this article for $Rs.\, 56.16$ and received two successive discounts of which one is $10 \% .$ Find out the other discount in this discount scheme offered by the shopkeeper. (in $Rs.$)

The difference between a discount of $35 \%$ and two successive discount of $20 \%$ on a certain bill was $Rs$ $22.$ Find the amount of the bill in $Rs.$