1.(0.15×6.4+0.2×2.2+0.6)×(1+60%)
=(0.96+0.44+0.6)×1.6
=2×1.6
=3.2(元)
2.〔(1-20%)×50%〕÷1
=〔0.8×0.5〕÷1
=0.4÷1
=40%