If $11$ Mango are bought for $Rs.\, 10$ and sold at $10$ for $Rs.\, 11 .$ What was Gain or Loss $\% ?$

A garment company declared $15 \%$ discount for wholesale buyers. Mr. Ashish bought garments from the company for $Rs.\, 25000$ after getting discount. He fixed up the selling price of garments in such a way that he earned a profit of $8 \%$ on original company price. What is the approximate total selling price? (in $Rs.$)

Arun purchased $30\, kg$ of wheat at the rate of $Rs.\,11.50$ per $kg$ and $20\, kg$ of wheat at the rate of $Rs.\,14.25$ per $kg$. He mixed the two and sold the mixture. Approximately at what price per $kg$ should he sell the mixture to make $30 \%$ profit? (in $Rs.$)

A shopkeeper sold an article offering discount of $5 \%$ and earn a profit of $23.5 \% .$ What would have been the percentage of profit earned if no discount has been offered?

A discount series of $10 \%, 20 \%$ and $40 \%$ is equal to a single discount of.......$\%$

A vendor bought toffees at $6$ for a rupee. How many for a rupee must he sell to gain $20 \% ?$