A shopkeeper cheats to the extent of $10 \%$ while buying as well as selling, by using false weights. His total gain is in $\%$
$10$
$11$
$20$
$21$
If the cost price of $20$ articles is equal to the selling price of $15$ articles, find the profit percent?
A shopkeeper purchased $70$ $kg$ of potatoes for $Rs.\, 420$ and sold the whole lot at the rate of $Rs.\, 6.5$ per $kg.$ What will be his gain percent?
A shopkeeper fixes the marked price of an item $35 \%$ above its cost price. The percentage of discount allowed to gain $8 \%$ is......$\%$
Three successive discounts of $10 \%, 12 \%$ and $15 \%$ will amount to a single discount of in $\%$?
A person sold a radio at a loss of $5 \% .$ Had he sold it for $Rs\, 210$ more, he would have gained $25 \%$. For what value should he sell it in order to gain $35 \% ?$