Find the error intervals for the following truncated numbers

Question 1:

0.00013 (2 s.f.)
0.00013≤x<0.00014

Question 2:

3.1 (1 d.p.)
3.1≤x<3.2

Question 3:

1.12 (2 d.p.)
1.12≤x<1.13

Question 4:

400 (1 s.f.)
400≤x<500