If the $CP$ of $50$ items is equal $SP$ of $40$ items then what is the profit or loss $\% ?$
$20$
$15$
$25$
$35$
Articles are marked at a price which gives a profit of $25 \%$. After allowing a certain discount the profit reduces to $12\frac{1}{2} \%$. The discount percent is
Successive discounts of $10 \%, 12 \%$ and $15 \%$ amount to a single discount of
Suresh buys a camera for $Rs.\,1800$ and sells it at $10 \%$ loss. Find out its selling price. (in $Rs.$)
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......$\%$
$'A ^{\prime}$ sells an article to $'B ^{\prime}$ at a gain of $20 \%$ and $' B ^{\prime}$ sells it to $'C ^{\prime}$ at a gain of $10 \%$ and $'C ^{\prime}$ sells it to $'D'$ at a gain of $12 \frac{1}{2} \%$. If ${ }^{\prime} D$ ' pays $Rs.\, 29.70$ what did it cost to $'A ^{\prime} ?$ (in $Rs.$)