1. (1) C (2) D
2. (1) 2.16 (2) 1 (3) 66.67%
3. 518。[提示]500+500× (5.6% — 2%) =500+18=518 (万元)
4. 68。[提示]105× (1+10%) — 50× (1 — 0.05%)
=105×110% — 50×0.95%
=115.5 — 47.5
=68 (万元)
5. (1) 6000 (2) 12600 (3) 852600