?? ????!?????1550?????????25%??
????:1?????app????:????????
2??????????
3???????????
4?????
5???????
?2?1??????????,????,??????????????,??????1550??25%????????300??????????2??????4??????????????????????????,1250???21?????????
?,?,?????????????????????
???2????1??????????,?,???25%????????(?? ????) ?????????????:?????????