Any multiple of 4 could be used (2 x 2 = 4). So 4, 8, 12, 16, etc. The total would be 25.
8924 is the number that comes 1100 numbers after 7824.
100
0.0091
27.5
the starting concentration divided by 1100
0.0182
0.0136
0.0045
2.75
52.381
100
It is: 1100