Paid amount for x3 a week + Sibling discount = 8460
Sibling discount for x1 a week = 1260
1260 x 4 = 5040
8460-5040 = 3420 ( Remaining amount that can be used for the next 5 kids.)
Sibling discount for x1 a week = 1260
1260 x 5 (kids) = 6300
6300 - 3420 = 2800
Remaining balance to be paid = AED 2880