The analysis is as follows:
15 students, if each student pays less than 200, then the total amount of money should be less than 3000. Therefore, () 87 (), the number on thousands may be 1 or 2, and the total amount of money can be divisible by 15, and the single digit may be 0 or 5. In this way, the total amount of money may be 2875,2870, 1875, 1870. Through calculation, only 1875 can be divisible by 15. So the actual total amount of money is 1875, and each student pays 125.
I hope I can help your children, and I wish your children grow up quickly and succeed in their studies!