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Price is the amount of money paid by the customer. Cost is the amount paid by the shopkeeper. We can say How much does it cost?
Value is the usefulness or importance of something. The value of milk as a food, the value of education. Face value is the amount printed on a piece of-paper-money or on a postage stamp.
Centre is the point that is equidistant from the edge of a circle. Middle is the area equidistant from two sides: middle of the road, middle of the room, middle of the page, etc.
Use people and not men when the reference is to human beings in general.