There are $100$ boxes in a room. $10$ people entered the house. The first one put a ball in each box. The second person put one ball in every 2nd box (that's mean 2nd, 4th, 6th etc. box), the third person put one ball in every third box and similarly the $10th$ person put one ball in every $10th$ box, what is the number of balls in the $48th$ box?