List price of a book is $Rs.\,100.$ A dealer sells three such books for $Rs.\, 274.50$ after allowing discount at a certain rate. Find the rate of discount in $\%$
$8.16$
$8.5$
$8.34$
$8.33$
A vendor bought toffees at $6$ for a rupee. How many for a rupee must he sell to gain $20 \% ?$
Mohit lost $18 \%$ by selling a bicycle for $Rs.\, 1230$. What percent shall he gain or loss by selling it for $Rs.\, 1600 ?$
A plate was sold for $Rs.\,6,300$ after giving two successive discounts of $12^{1 / 2} \%$ and $10 \% .$ Find the marked price. (in $Rs.$)
A wholesaler had $200$ dozens of mangoes. He sold some of these mangoes at $20 \%$ profit and the rest at $10 \%$ profit, so that he made $13 \%$ profit on selling all the mangoes. How many mangoes (in dozens) did he sells at $20 \%$ profit?
There would be a $10 \%$ loss, if rice is sold at $Rs.\, 54$ per $kg.$ To earn a profit of $20 \%,$ the price of rice per $kg$ will be (in $Rs.$)