??
???2???????2? ????(BBC)???????????,???2????1???,??,???????????????25%??????????,??
??????????????????????????????????????,??,?1550????????25%?????????????????300?2?????????4???,1250??21???
??????????,?????????????,???????????
???????,??????????,???????25%??????????,????????????10%?
???????????????,????????????????,?????,????????? ??????:????
?????????
?????????:????????1550??25%??????????????????????