500
actually 300.
1-99= 20
100-199=20
200-299=120
300-399=20
400-499=20
500-599=20
600-699=20
700-799=20
800-899=20
900-999=20
1-999= 300
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310.
2000
39
20 of them.
To get the 2s complement, find the 1s complement (by inverting the bits) and add 1. Assuming that number is [4-bit] binary it would be 1000. If it is preceded by 0s, as in, for example, 0000 1000, then it would be 1111 1000.