Rajesh purchased a mobile phone and a refrigerator for $Rs.\, 12000$ and $Rs.\, 10000$ respectively. She sold the refrigerator at a loss of $12$ percent and mobile phone at a profit of $8$ per cent. What is her overall loss$/$profit?

Aditya purchase a book with a $20 \%$ discount on the marked price. How much $Rs.$ did he pay if the book marked was $Rs.$ $500 ?$

A person purchases $8$ pens for ₹ $10$ and sells $10$ pens for ₹ $8.$ How much profit or loss does he make in ?

Maninder bought two horses at $Rs.\, 40,000$ each. He sold one horse at $15 \%$ gain, but had to sell the second horse at a loss. If he had suffered a loss of $Rs.3,600$ on the whole transaction, then the selling price of the second horse is (in $Rs.$)

Present age of Bob is equal to Abby's age $8\, years$ ago. Four years hence, the respective ratio between Bob's age and Abby's age will be $4: 5$ at that time. What is Bob's present age? (in $years$)

The cost price of $6$ pens is equal to the selling price of $4$ pens. Find the profit percent.