Elsa will be in Valencia for 4 weeks (from Monday 1 until Friday 26) and wants to do an intensive course while she is here, but will be away during the third week (Monday 15 - Friday 19), so she has to pay just for 3 weeks: week 1, week 2, week 3 and week 4.

Jorge has booked 4 weeks of intensive course (from Monday 1 until Friday 26), but a plan with friends has come up and he has decided to take week 3 off: since it had already been paid and can no longer be deducted from the price, that week is postponed so that he can do it at another time (maybe extend his current booking and finish 1 week later than originally planned).

Beatriz had purchased 1 week of intensive course (from Monday 1 to Friday 5) for €100, but something has happened and she cannot make it today: since she had informed the school earlier this morning before the class started, she now has a credit of €20 (€100 paid for 5 days of class = €20 each) to spend on any type of course (and rate) she wants at another time (no deadline).

Carlos had purchased 2 weeks of intensive course (from Monday 1 to Friday 12) for €180, but something has come up and he needs to be elsewhere next week: since he has not informed the school at least 10 days ahead, that week cannot be postponed, but he now has a credit of €90 (€180 paid for 2 weeks of class = €90 each) to spend on any type of course (and rate) she wants at another time (no deadline).