How much does MEXC charge per transaction?

Could you please elaborate on the transaction fees charged by MEXC? Are there any specific fees for different types of transactions, such as buying, selling, or withdrawing cryptocurrencies? Are the fees fixed or do they vary based on the size of the transaction? Additionally, does MEXC offer any fee discounts or promotions for frequent traders? Understanding the transaction fees charged by MEXC is crucial for traders to make informed decisions and manage their costs effectively.