Hi, I have a mindee who comes different hours and different days every week, i basically keep a full time space available for him as i never know when he will be coming from one week 2 the next. We agreed that she would pay a min of 10 hours a week based on an average of his weekly hours (after he had been coming for a few weeks) but lately his average hours are around 20, do you think it is fair to ask her to increse her min weekly payment because of this to say 18 hours a week? her contract is due to be reviewed in april.