Mr Virmani purchased a house for $₹ 365000$ and spent $₹ 135000$ on its repairs. If he sold it for $₹ 550000,$ If he gains $k\%$, find the value of $k$.

Shikha purchased a wristwatch for $₹ 840$ and sold it to her friend Vidhi for $₹ 910$. Find her gain percent.

A businessman makes a $10\%$ profit by selling a toy costing him $₹ 120$. What is the selling price?

Harish purchased $50$ dozen bananas for $₹ 135$. Five dozen bananas could not be sold because they were rotten. At what price per dozen should Harish sell the remaining bananas so that he makes a profit of $20\%$ ?

A woman bought $50$dozen eggs at $₹ 6.40$  a dozen. Out of these $20$ eggs were found to be broken. She sold the remaining eggs at $55$ paise per egg. Find her gain or loss percent.

Jyotsana bought $400$ eggs at $₹ 8.40$ a dozen. The price per hundred must she sell them so as to earn a profit of $15\%$ is $₹k$. Find the value of $k$.

A shopkeeper makes a profit of $15\%$ by selling a book for $₹ 230$. What is the $C.P.$ and the actual profit ?

A bookseller sells all his books at a profit of $10\%.$ If he buys a book from the distributor at$₹ 200,$ how much does he sell it for?

A floweriest buys $100$ dozen roses at Rs $2$ a dozen. By the time the flowers are delivered, $20$ dozen roses are mutilated and are thrown away. At what price should he sell the rest if he needs to make a $20\%$ profit on his purchase ?