?????? ?????????????? 60?. ???????? ?????????? 41-42?. ??????? ?????? ?? ??????? ????????????.
??? ???? ??????? ?????? ?????? ??????? ?????????? 80% ????????. ???? ??? ??????????, ? ??? ??? ????????? 50?. ? ??????? ?????? ?????? ??????? ?????????? 100%. ???? ??????????? ?????? ? 80% ?????????????? ???????? ????? 60?.-20%=48?. ?????? ???????? ?? ????? ????????? ?????? ?????? ?? 48-50?, ? ??? ?????????