On a $Rs.\,10,000$ payment order, a person has a choice between three successive discounts of $10 \%, 10 \%$ and $30 \%$ and three successive discounts of $40 \%, 5 \%$ and $5 \% .$ By choosing the better offer, he can save in $Rs.$?

A shopkeeper sells an article at a gain of $10 \% .$ Had he sold it at a loss of $20 \%,$ its selling price would have been $Rs.\,180$ less. What is the cost price of the article? (in $Rs.$)

A man bought orange at the rate of $8$ for $Rs.\,34$ and sold them at the rate of $12$ for $Rs.\,57.$ How many oranges should be sold to earn a net profit of $Rs.\,45?$

Hundred oranges are bought at the rate of $Rs.\, 350$ and sold at the rate of $Rs.\, 48$ per dozen. The percentage of profit or loss is 

The difference between successive discounts of $40 \%$ followed by $30 \%$ and $45 \%$ followed by $20 \%$ on the marked price of an article is $Rs.\,12.$ The marked price of the article is (in $Rs.$)

A dealer buys a table listed at $Rs.\, 600$ and gets successive discount of $10 \%$ and $20 \% .$ What is his profit or loss percent if he sells at $Rs.$ $540 ?$