There is a profit of $20 \%$ on the cost price of an article. The per cent of profit, when calculated on selling price is.......$\%$

A man loses $20 \frac{1}{2} \%$ of his money and after spending $80 \%$ of the remainder, he is left with $Rs.\, 159 .$ How much did he have at first? (in $Rs.$)

If the selling price of $50$ articles is equal to the cost price of $40$ articles, then the loss or gain percent is 

$A, B, C$ are partners in a business. During a particular $year,$ A received one third of the profit, $B$ received $\frac{1}{4}$ of the profit and $C$ received the remaining $Rs.\, 5000$ How much amount of money did A receive? (in $Rs.$)

By selling $90$ pens for $Rs.\, 80$ a man loses $20 \%$. What should be the selling price (in $Rs.$) of $90$ pens for $20\%$ profit?

A person bought an article for $Rs\,240.$ For how much should he sell it so as to lose $20 \% ?$