Answer :
1. [tex](1-0.2)(1-0.1)(1-0.1) \times 1600 + 0.15 \times 1600 = 1276.8[/tex]
2. [tex](1-0.1)\times(1+0.4) \times 700 + 0.8\times 700 = 1442[/tex]
2. [tex](1-0.1)\times(1+0.4) \times 700 + 0.8\times 700 = 1442[/tex]