i
ii
iii
iv
v
vi
1
2
3
4
5
(b) (a) (b) (c) = 100% (a) 6
7
(b) (a) (b) (c) = 100% (a) 2 456 329 13% 12 120 7.1 0.06% 8
9
10
11
12
13
14
15
16
17
18
19
20
(a) (b) (c) 21
22
23
24
25
26
27
28
29
30
31
= = =