If he says to the broker: Sell this for such and such an amount and anything more than that is yours

No File Exists
Check below answers in case you are looking for other related questions:
If an agent sells a product for more than the price stipulated, who does the extra money belong to?
He was asked to sell the product for a specific price but he is selling it for more and keeping the difference

No File Exists
Related Answers:
He is an agent for a company and he sells goods for a price higher than that of the company and keeps the extra amount
He is going to obtain an agency to distribute goods on condition that he deposit a sum of money with the company for which interest will be paid to him
Ruling on working as a debt collector for a riba-based financial institution
If an agent sells a product for more than the price stipulated, who does the extra money belong to?
He was asked to sell the product for a specific price but he is selling it for more and keeping the difference

Recommended answers for you:
Division of parents’ estate between sons and daughters.
Why is the apostate to be executed in Islam?
Things that make ghusl obligatory
Being Successful in Life
Ruling on smoking the argileh or shisha – and a discussion on its harmful effects