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    68362.3-68020.5=
    68362.3×0.995
    (2.5+0.6+0.3+0.2)*(3.5+0.2)*0.12= (2.15+0.2)*(3.5+0.2)*0.12=
    1.4*0.2*(0.3-0.1)
    4.2*0.2*(0.4-0.1)
    4.7*0.2*(0.5-0.1)
    4.2*0.2*(0.4-0.1)
    4.2*0.2*(0.4-0.1)
    2.5*0.2*(0.5-0.1)
    1.4*0.2*(0.4-0.1)
    4.2*0.2*(0.4-0.1)
    2.5*0.2*(0.5-0.1)
    4.7*0.2*(0.5-0.1)
    2.5*0.2*(0.3-0.1)
    4.2*0.2*(0.4-0.1)
    2.5*0.2*(0.3-0.1)
    2.5*0.2*(0.5-0.1)
    2.5*0.2*(0.4-0.1)
    (0.3+0.6+2.5)*0.2*(0.4-0.1)
    2.5*0.2*(0.4-0.1)

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