By Selling $80\, ball$ pens for $Rs.\, 140$, a retailer loses $30 \% .$ How many ball pens should he sell for $Rs.\,104$ so as to make a profit of $30 \% ?$

A men sells two houses at the rate of $Rs.\,1.995$ Lakhs each. On one house he gains $20 \%$ and on the other he loses $20 \% .$ His gain or loss per cent in the whole transaction is

If a stall sell a pizza at $Rs.\, 200$ he makes $20 \%$ loss if he wants to make $10 \%$ profit then at what price (in $Rs.$) should he sell?

A shopkeeper purchases two items for $Rs.\, 520 .$ One of them is sold gaining $16 \%$ and the other at a loss of $10 \%,$ thus making no profit or loss. What is the selling price of the item sold at loss?

A shopkeeper sold one$-$third of his goods at a loss of $15 \% .$ To get a profit of $10 \%$ on the whole transaction, he should sell the remaining articles at a profit of in $\%$

A person incurs $5 \%$ loss by selling a watch for $Rs.\,1140 .$ At what price should the watch be sold to earn $5 \%$ profit in $Rs.$?