The amount required for making an order is different for the market and limit orders.
The sum needed for making a market order = Number of tokens * Price + exchange fee, % + A price change correction,%*
The sum needed for making a limit order = Number of tokens * Price + exchange fee,%.
*A price change correction is equal to 0.2% of the cost of purchased tokens. In case the price hasn't changed or changed towards the better side the aforementioned sum of money will be not charged.