A shopkeeper gains the cost of $8$ metres thread by selling $40$ metres thread. Find his gain percent.
$19$
$20$
$22$
None of these
If $5 \%$ more is gained by selling an article for $Rs.\, 350$ than by selling it for $Rs$ $340,$ the cost of the article is......$\%$
A shopkeeper bought $30\, Kg$ of wheat at the rate of $Rs.\,45$ per $Kg.$ He sold $40\%$ of the total quantity at the rate of $Rs.\,50$ per $Kg.$ Approximately, at what price per $Kg$ should he sell the remaining quantity to make $25$ percent overall profit? (in $Rs.$)
A person sells $36$ oranges per $Rs.\, 1$ and makes a loss of $4 \% .$ Find how many oranges per $Rs$ to be sold to have a gain of $8 \% ?$
An article is sold at a profit of $20 \%$. If both the cost price and selling price are $RS.\, 150$ less, profit would be $5 \%$ more. Find the cost price.
A cab driver makes a profit of $20 \%$ on every trip when he carries $3$ passengers and the price of petrol is $Rs.\,30$ a litre. Find the percentage profit for the same journey if he goes with four passengers per trip and the price of petrol reduces to $Rs.\, 24$ a litre? (in $\%$)
(Assume that revenue per passenger is the same in both the cases.)