You'd get 100% of the task value credited to your wallet. Process and expenses of converting cryptocurrency to "real money" (cash?), vary from an individual and countries have different cryptocurrency laws. In Serbia, you'd end up paying 15% of the sold value to tax agency. There's been a rise in OTC trades allowing for 1:1 conversion.

Transaction fees wise, ETH fees are quite high at the moment. It'd cost you around $2 to transfer funds from the platform to your wallet. Higher the task value, smaller % of it, transaction fees make. You can always decide not to withdraw your funds right away, allowing you to collect a certain amount and save up on transaction fees.