daily rate for childcare?

number of hours * hourly rate is what I would expect as a babysitter, absolutely no less. And la Ligue des Familles rates are much cheaper than 10 euro an hour, it's 5 euro an hour between 7-21h.
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Kidfarwest chain of creches now do occasional care charged per day, that's an alternative, or just a local halte-accueil would also be a cheaper alternative than a babysitter - typical daily price there would be no more than 30 euro for the day.