????:????????1550??25%?????????

?????2???2?? ???(BBC)??????????,??2????????????????1???,???????????????,??25%???,???

?,??????????,???????????1550????25%??????????????300?????????2????????????4?????,1250??????????21??

???????,??????????????????????????????????????,?????

????????,??????????????,?????????????????25%????????,?????????????10%?

???,??????????,???,?? ???:????????