public BigDecimal getHouseholdExpenses(Household household) {
		Set<Student> mentored = household.getMentored();
		BigDecimal amount = new BigDecimal(0.0);
		for (Student s : mentored) {
			// 1º Get activities prize
			Set<Activity> activities = s.getActivities();
			for (Activity a : activities) {
				amount = amount.add(a.getPrize());
			}
			// 2º Get bookings prize
			Set<Booking> bookings = s.getBookings();
			for (Booking b : bookings) {
				amount = amount.add(b.getDiningHall().getPrice());
			}
		}
		return amount;
	}