10*x+21*1.3x=850000
    10*x+21*1.2x=850000
    10*x+21*x*(1+0.2)=850000
    10*x+21*x*(1+0.2)
    X+(x*.13)=140000
    X+(x*.13)=20000
    X+(x*.13)=1600
    1.4x×0.8=24
    x（1+0.4）×0.8=24
    X+(x*.13)=19000
    x（1+0.4）×0.8
    X+(x*.13)=22000
    1.4x×0.8-x=24
    4x×0.8-x=24
    X+(x*.13)=84000
    X+(x*.13)=44000
    X+(x*.13)=9600
    X+(x*.13)=35400
    X+(x*.13)=72000
    X+(x*.13)=144000

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