.
4000
400
0.0004
0.00004
4
400
None of these choices.
400000
4000
0.0004
0.000004
4
400
None of these choices.
4000000
40004
0.00004
0.0000004
4
400
None of these choices.
None of these choices.
40000
400
4000
4
1/4
1/400
1/4000
1/40000