A shopkeeper buys 75 parker pens. He sells two-third of these and gains Rs. 18o on each. He?

You need to read what you type and correct the mistakes. You can not tolerate mistakes in arithmetic, and they are hard to put up with in other subjects. The o and 0 keys are close together, so you must look to see if you typed one by mistake.

Profit is not the same as markup. You need to understand that perfectly. If a dealer sells pens for Rs 180 more than he paid then we say his markup is 180. "Gain" is a general term not which can refer to either markup or profit. Profit is what is left of the gain after expenses are considered, such as rent on his space, lights, wages, and so on.

You will need to compose a new question to eliminate the mistakes.