2,500
2539, 2541 and 2542 rounded to the nearest ten will round to 2540.
0
2500
3000
2540
372 rounded to the nearest hundred is 400
300
100
4198 to the nearest 100 = 4200
10100
The answer is zero.
95,96,97,98,99 round them up to the ten, all 100 to the 100, all 100.