By selling $144$ hens, Mala lost the SP. of $6$ hens. Find her loss $\%$.

A shopkeeper sold two pair of jeans for $₹720$ each, gaining $20\%$ on one and losing $20\%$ on the other. Find his gain or loss $\%$.

John bouhgt two horses at $₹20,000$ each. He sold one horse at $15\%$ gain. But he had to sell the second horse at a loss. If he had suffered a loss of $₹1800$ on the whole transaction, find the selling price of the second horse.

A shopkeeper buys two T.V sets of the same type. He sells one of them at a profit of $20\%$ and the other at a loss of $5\%$. If the difference in selling price is $₹700$, find the cost price of each T.V set.

A publisher sells a book for $₹168$ at a profit of $20\%$. If his cost of production increases by $30\%$, what should be the increase in the price of the book so that his percentage of profit remains the same?

The difference in prices when a commodity is sold at a profit of $4\%$ and at a profit of $6\%$ is $₹3$. Find the selling prices of the commodity in both the cases.

A man buys a plot of land at $₹3,60,000$. He sells one-third of the plot at a loss of $20\%$. Again, he sells two-thirds of the plot left at a profit of $25\%$.At what price should he sell the remaining plot in order to get a profit of $10\%$ on the whole?