A manufacturer sells an article to a wholesale dealer at a profit of $10 \%$. The wholesale dealer sells it to a shopkeeper at $20 \%$ profit. The shopkeeper sells it to a customer for $Rs.\, 56,100$ at a loss of $15 \%$. Then the cost price of the article to the manufacturer is (in $Rs.$)

A man sold two cows at $Rs. \,1995$ each. On one he lost $10 \%$ and on the other he gained $10 \% .$ What his gain or loss percent?

If the selling price of $\frac{2}{3}$ of a certain quantity of milk be equal to the cost price of whole milk, then what will be the gain percent in this transaction?

Rahim bought a gift item for $Rs.\,510$ after getting a discount of $15 \% .$ He then sells it $5 \%$ above the marked price. The profit earned in this deal is (in $Rs.$)

A man bought $500$ metres of electronic wire at $50$ paise per metre. He sold $50 \%$ of it at a profit of $5 \%$ At what percent should he sell the remainder so as to gain $10 \%$ on the whole transaction?

What profit/loss percent did Ravi earn if he purchased an item of $Rs.\,5600$ and sold it at $3/4$ of its cost price?