How much should I charge per hour for English lessons?

I'm a student working as a language assistant in Spain but one of the teachers wants me to give private tuitition to 2 members of his family. He wants me to work 1 hour 10 mins one day (40 mins with one person and 10 mins with the other) and 1 hour the next (full hour with one person). I will mostly be doing oral work - having discussions/reading stories to the younger one. But I don't know how much I should charge?

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