I want to create a task but...

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I don't really understand how the task system works. I've tried to create a task where people would get $0.10 for accomplishing the task and the max. number of workers would be 10. However, first it said I'd need to add at least $1.2 dollars as funds first. Okay I thought, $1 for the workers and $0.20 fee. But then it said I would need at least $10 to be able to add funds?! Why do I need 10 bucks if it is actually $1.2 ? I don't get it. Please, can someone explain?