A person sells $36$ apple per rupee and suffers a loss of $4 \% .$ Find how many apple per rupees to be sold to have a gain of $8 \%$.

Two third of consignment was sold at a profit of $5 \%$ and the remainder at a loss of $2 \%$. If the total profit was $Rs.\, 400$ , the value of the consignment was in $Rs.$?

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 $Rs.$?

An article is sold for $Rs.\,4950$ at a gain of $10 \% .$ What would have been the gain or loss per cent if it had been sold for $Rs$ $4275 ?$

A shopkeeper gives $12 \%$ additional discount on the discounted price, after giving an initial discount of $20 \%$ on the labelled price of a radio. If the final selling price of the radio is $Rs \,704$ then what is its labelled price?(In $Rs$)

If the cost price of $12$ pens is equal to selling price of $8$ pens, find the gain percent.