[求助]

怎么算出来的

19. Recent estimates predict that between 1982 and
1995 the greatest increase in
 the number of people employed will be in the
category of low-paying service
occupations. This category, however, will not
increase its share of total
employment, whereas the category of high-paying
service occupations will increase
 its share.
If the estimates above are accurate, which of the
following conclusions can be
 drawn?
 (A) In 1982 more people were working in low-paying
service occupations than were
working in high-paying service occupations.
(B) In 1995 more people will be working in
high-paying service occupations than
will be working in low-paying service occupations.
(C) Nonservice occupations will account for the same
share of total employment in
1995 as in 1982.
(D) Many of the people who were working in
low-paying service occupations in 1982
 will be working in high-paying service occupations
 by 1995.
(E) The rate of growth for low-paying service
occupations will be greater than the
overall rate of employment growth between 1982 and
1995.