=?/
=?+-/FOB
=?574980+?574980*6%?-574980/?1+17%?*9%?/73000-1540-443
=7.96/
2.?
=?-?
=73000*8.3-?574980+?574980*6%?-574980/?1+17%?*9%?
=40650.43?