10,000•2+10,000(1-0.4)
=20,000+10,000•0.6
=20,000+6,000
=26,000
19•30+(30-19)(30-25)
=570+11•5
=570+55
=625
8,000•0.3=2,400
110•60+110(1-0.3)(90-60)
=6,600+110•0.7•30
=6,600+77•30
=6,600+2,310
=8,910
4,000•10+(4,000-500)(30-10)+(4,000-1,000)(50-30)
=40,000+3,500•20+3,000•20
=40,000+70,000+6,000
=116,000
2,000•10(1-0.2)+2,000(1/2)•20(1-0.15)
=20,000•0.8+1,000•20•0.85
=20,000•0.8+20,000•0.85
=20,000(0.8+0.85)
=20,000•1.65
=33000
